Mercurial > public > mk2
annotate code_part1/OSTC_code_asm_part1/ms5535.asm @ 618:6b9713b56bca
2.28beta release
| author | heinrichsweikamp |
|---|---|
| date | Mon, 23 Jul 2012 17:12:33 +0200 |
| parents | f53aa96ff2f4 |
| children | 422b9eeace4f |
| rev | line source |
|---|---|
| 0 | 1 ; OSTC - diving computer code |
| 2 ; Copyright (C) 2008 HeinrichsWeikamp GbR | |
| 3 | |
| 4 ; This program is free software: you can redistribute it and/or modify | |
| 5 ; it under the terms of the GNU General Public License as published by | |
| 6 ; the Free Software Foundation, either version 3 of the License, or | |
| 7 ; (at your option) any later version. | |
| 8 | |
| 9 ; This program is distributed in the hope that it will be useful, | |
| 10 ; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 12 ; GNU General Public License for more details. | |
| 13 | |
| 14 ; You should have received a copy of the GNU General Public License | |
| 15 ; along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 16 | |
| 17 | |
| 18 ; routines for Intersema MS5535A, MS5541B and MS5541C | |
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19 ; history: |
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20 ; 2005-09-26: Written by Matthias Heinrichs, info@heinrichsweikamp.com |
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21 ; 2008-08-21: MH last updated, with second order compensation. |
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22 ; 2011-01-19: jDG Clean up using true signed arithmetics. |
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BUGFIX protect against ISR changing pressure/temperature while reading it.
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23 ; 2011-05-19: jDG Avegaring temperature and amb_pressure in private variable, |
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24 ; Use signed 16bit value for temperature (compat with avg !). |
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25 ; |
| 0 | 26 ; known bugs: |
| 27 ; ToDo: | |
| 28 | |
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29 ;============================================================================= |
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30 ; Expose internal variables, to ease debug: |
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31 global D1, D2 |
| 289 | 32 global C1, C2, C3, C4, C5, C6 |
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33 global xdT, xdT2, OFF, SENS, amb_pressure_avg, temperature_avg |
| 0 | 34 |
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35 ;============================================================================= |
| 0 | 36 calculate_compensation: |
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37 ; calculate UT1 = 8*C5 + 10000 (u16 range 10.000 .. +42.760) |
| 0 | 38 clrf isr_xA+1 |
| 39 movlw d'8' | |
| 40 movwf isr_xA+0 | |
| 41 movff C5+0,isr_xB+0 | |
| 42 movff C5+1,isr_xB+1 | |
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43 call isr_unsigned_mult16x16 ;isr_xA*isr_xB=isr_xC |
| 0 | 44 movlw LOW d'10000' |
| 45 addwf isr_xC+0, f | |
| 46 movlw HIGH d'10000' | |
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47 addwfc isr_xC+1, f ;isr_xC= 8*C5 + 10000 |
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48 |
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49 ; xdT = D2 - UT1 (s16 range -11.400 .. +12.350) |
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50 movf isr_xC+0,W ; Get Value to be subtracted |
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51 subwf D2+0,W ; Do the Low Byte |
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52 movwf xdT+0 |
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53 movf isr_xC+1,W ; Then the high byte. |
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54 subwfb D2+1,W |
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55 movwf xdT+1 |
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56 |
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57 ; Second order temperature calculation |
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58 ; xdT/128 is in range -89..+96, hence signed 8bit. dT/128 = (2*dT)/256 |
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59 rlcf xdT+0,W ; put hit bit in carry. |
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60 rlcf xdT+1,W ; inject in high byte. |
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61 movwf isr_xA+0 ; and put result in low byte. |
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62 clrf isr_xA+1 |
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63 btfsc xdT+1,7 ; If dT < 0 |
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64 setf isr_xA+1 ; then signextend to -1 |
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65 movff isr_xA+0,isr_xB+0 ; copy A to B |
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66 movff isr_xA+1,isr_xB+1 |
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67 call isr_signed_mult16x16 ; dT*dT --> xC (32 bits) |
| 0 | 68 |
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69 ; dT >= 0: divide by 8, ie. 3 shifts rights. |
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70 ; dT < 0: divide by 2, ie. 1 shifts rights. |
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71 movlw .3 |
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72 btfss xdT+1,7 ; Was dT negatif ? |
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73 movlw .1 |
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74 calc_loop_1: |
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75 bcf STATUS,C ;dT^2 is positiv, so injected zeros. |
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76 rrcf isr_xC+1,F |
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77 rrcf isr_xC+0,F |
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78 decfsz WREG |
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79 bra calc_loop_1 |
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80 |
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81 movf isr_xC+0,W ; dT2 = dT - (dT/128)*(dT/128)/(2 ...or... 8) |
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82 subwf xdT+0,W |
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83 movwf xdT2+0 |
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84 movf isr_xC+1,W |
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85 subwfb xdT+1,W |
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86 movwf xdT2+1 |
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88 ; Calculate OFF = C2 + ((C4-250)*dT2)/2^12 + 10000 |
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89 ; (range +9.246 .. +18.887) |
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90 movlw LOW(-.250) ; C4 - 250 --> A |
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91 addwf C4+0,W |
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92 movwf isr_xA+0 |
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93 movlw -1 ; HIGH(- .250) is not hunderstood... |
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94 addwfc C4+1,W |
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95 movwf isr_xA+1 |
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96 |
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97 movff xdT2+0,isr_xB+0 ; dT2 --> B |
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98 movff xdT2+1,isr_xB+1 |
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99 call isr_signed_mult16x16 |
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100 movlw .12-.8 ; A 12bit shift = 1 byte + 4 bits. |
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101 call isr_shift_C31 |
| 0 | 102 |
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103 movlw LOW(.10000) ; Add 10000 |
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104 addwf isr_xC+1,F |
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105 movlw HIGH(.10000) |
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106 addwfc isr_xC+2,F |
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107 |
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108 movf C2+0,W ; Add C2, and save into OFF |
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109 addwf isr_xC+1,W |
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110 movwf OFF+0 |
| 0 | 111 movf C2+1,W |
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112 addwfc isr_xC+2,W |
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113 movwf OFF+1 |
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114 |
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115 ; Calculate SENS = C1/2 + ((C3+200)*dT)/2^13 + 3000 |
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116 movlw LOW(.200) ; C3+200 --> A |
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117 addwf C3+0,W |
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118 movwf isr_xA+0 |
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119 movlw HIGH(.200) |
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120 addwfc C3+1,W |
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121 movwf isr_xA+1 |
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122 ; B still contains dT2 |
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123 call isr_signed_mult16x16 ; A*B --> C |
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124 movlw .13-.8 ; A 13bit shift = 1 byte + 5 bits. |
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125 call isr_shift_C31 |
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126 |
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127 bcf STATUS,C ; SENS = C1 / 2 |
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128 rrcf C1+1,W |
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129 movwf SENS+1 |
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130 rrcf C1+0,W |
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131 movwf SENS+0 |
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132 |
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133 movlw LOW(.3000) ; Add 3000 |
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134 addwf isr_xC+1,F |
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135 movlw HIGH(.3000) |
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136 addwfc isr_xC+2,F |
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138 movf isr_xC+1,W ; And sum into SENS |
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139 addwf SENS+0,F |
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140 movf isr_xC+2,W |
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141 addwfc SENS+1,F |
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142 |
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143 ; calculate amb_pressure = (sens * (d1-off))/2^12 + 1000 |
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144 movf OFF+0,W ; d1-off --> a |
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145 subwf D1+0,W |
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146 movwf isr_xA+0 |
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147 movf OFF+1,W |
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148 subwfb D1+1,W |
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149 movwf isr_xA+1 |
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151 movff SENS+0,isr_xB+0 ; sens --> b |
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152 movff SENS+1,isr_xB+1 |
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153 call isr_signed_mult16x16 |
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154 movlw .12-.8 ; a 12bit shift = 1 byte + 4 bits. |
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155 call isr_shift_C31 |
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156 |
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157 movlw LOW(.1000) ; add 1000 |
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158 addwf isr_xC+1,F |
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159 movlw HIGH(.1000) |
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160 addwfc isr_xC+2,F |
| 0 | 161 |
| 162 btfss simulatormode_active ; are we in simulator mode? | |
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163 bra calc_compensation_2 ; no |
| 0 | 164 |
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165 movff sim_pressure+0,isr_xC+1 ; override readings with simulator values |
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166 movff sim_pressure+1,isr_xC+2 |
| 0 | 167 |
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168 calc_compensation_2: |
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169 movf isr_xC+1,W ; Then sum_up to pressure averaging buffer. |
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170 addwf amb_pressure_avg+0,F |
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171 movf isr_xC+2,W |
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172 addwfc amb_pressure_avg+1,F |
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173 |
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174 ; calculate temp = 200 + dT*(C6+100)/2^11 |
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175 movlw LOW(.100) ; C6 + 100 --> A |
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176 addwf C6+0,W |
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177 movwf isr_xA+0 |
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178 movlw HIGH(.100) |
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179 addwfc C6+1,W |
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180 movwf isr_xA+1 |
| 0 | 181 |
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182 movff xdT2+0,isr_xB+0 ; dT2 --> B |
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183 movff xdT2+1,isr_xB+1 |
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184 call isr_signed_mult16x16 ; A*B |
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185 movlw .11-.8 ; A 12bit shift = 1 byte + 3 bits. |
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186 call isr_shift_C31 |
| 0 | 187 |
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188 movlw LOW(.200) ; Add 200 |
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189 addwf isr_xC+1,F |
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190 movlw HIGH(.200) |
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191 addwfc isr_xC+2,F |
| 0 | 192 |
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193 movf isr_xC+1,W |
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194 addwf temperature_avg+0,F |
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195 movf isr_xC+2,W |
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196 addwfc temperature_avg+1,F |
| 0 | 197 |
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198 return ; Fertig mit allem |
| 0 | 199 |
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200 ;============================================================================= |
| 0 | 201 get_pressure_start: |
| 202 rcall reset_MS5535A | |
| 203 movlw b'10100000' ;+3*high as start and 1+low as stop! | |
| 204 get_pressure_start2: | |
| 205 movwf isr1_temp | |
| 206 movlw d'12' | |
| 207 movwf clock_count | |
| 208 rcall send_data_MS55535A | |
| 209 return | |
| 210 | |
| 211 get_pressure_value: | |
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212 #ifndef TESTING |
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213 ; Use register injection instead when in MPLab Sim emulation... |
| 0 | 214 rcall get_2bytes_MS5535A |
| 215 movff dMSB,D1+1 | |
| 216 movff dLSB,D1+0 | |
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217 #endif |
| 0 | 218 return |
| 219 | |
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220 ;============================================================================= |
| 0 | 221 get_temperature_start: |
| 222 rcall reset_MS5535A | |
| 223 movlw b'10010000' ;+3*high as start and 1+low as stop! | |
| 224 bra get_pressure_start2 ; continue in "get_pressure" | |
| 225 | |
| 226 get_temperature_value: | |
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227 #ifndef TESTING |
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228 ; Use register injection instead... |
| 0 | 229 rcall get_2bytes_MS5535A |
| 230 movff dMSB,D2+1 | |
| 231 movff dLSB,D2+0 | |
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232 #endif |
| 0 | 233 return |
| 234 | |
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235 ;============================================================================= |
| 0 | 236 get_calibration_data: |
| 237 rcall reset_MS5535A | |
| 238 movlw d'13' | |
| 239 movwf clock_count | |
| 240 movlw b'01010100' ;+3*high as start and 1+low as stop! | |
| 241 movwf isr1_temp | |
| 242 rcall send_data_MS55535A | |
| 243 rcall get_2bytes_MS5535A | |
| 289 | 244 |
| 245 #ifdef TESTING | |
| 246 movlw LOW(.18556) | |
| 247 movff WREG,W1+0 | |
| 248 movlw HIGH(.18556) | |
| 249 movff WREG,W1+1 | |
| 250 #else | |
| 0 | 251 movff dMSB,W1+1 |
| 252 movff dLSB,W1+0 | |
| 289 | 253 #endif |
| 0 | 254 |
| 255 movlw d'13' | |
| 256 movwf clock_count | |
| 257 movlw b'01011000' ;+3*high as start and 1+low as stop! | |
| 258 movwf isr1_temp | |
| 259 rcall send_data_MS55535A | |
| 260 rcall get_2bytes_MS5535A | |
| 289 | 261 #ifdef TESTING |
| 262 movlw LOW(.49183) | |
| 263 movff WREG,W2+0 | |
| 264 movlw HIGH(.49183) | |
| 265 movff WREG,W2+1 | |
| 266 #else | |
| 0 | 267 movff dMSB,W2+1 |
| 268 movff dLSB,W2+0 | |
| 289 | 269 #endif |
| 0 | 270 |
| 271 movlw d'13' | |
| 272 movwf clock_count | |
| 273 movlw b'01100100' ;+3*high as start and 1+low as stop! | |
| 274 movwf isr1_temp | |
| 275 rcall send_data_MS55535A | |
| 276 rcall get_2bytes_MS5535A | |
| 289 | 277 #ifdef TESTING |
| 278 movlw LOW(.22354) | |
| 279 movff WREG,W3+0 | |
| 280 movlw HIGH(.22354) | |
| 281 movff WREG,W3+1 | |
| 282 #else | |
| 0 | 283 movff dMSB,W3+1 |
| 284 movff dLSB,W3+0 | |
| 289 | 285 #endif |
| 0 | 286 |
| 287 movlw d'13' | |
| 288 movwf clock_count | |
| 289 movlw b'01101000' ;+3*high as start and 1+low as stop! | |
| 290 movwf isr1_temp | |
| 291 rcall send_data_MS55535A | |
| 292 rcall get_2bytes_MS5535A | |
| 289 | 293 #ifdef TESTING |
| 294 movlw LOW(.28083) | |
| 295 movff WREG,W4+0 | |
| 296 movlw HIGH(.28083) | |
| 297 movff WREG,W4+1 | |
| 298 #else | |
| 0 | 299 movff dMSB,W4+1 |
| 300 movff dLSB,W4+0 | |
| 289 | 301 #endif |
| 0 | 302 |
| 303 ; calculate C1 (16Bit) | |
| 304 movff W1+1, C1+1 | |
| 305 bcf STATUS,C | |
| 306 rrcf C1+1 | |
| 307 bcf STATUS,C | |
| 308 rrcf C1+1 | |
| 309 bcf STATUS,C | |
| 310 rrcf C1+1 | |
| 311 movff W1+0, C1+0 | |
| 312 bsf STATUS,C | |
| 313 btfss W1+1,0 | |
| 314 bcf STATUS,C | |
| 315 rrcf C1+0 | |
| 316 bsf STATUS,C | |
| 317 btfss W1+1,1 | |
| 318 bcf STATUS,C | |
| 319 rrcf C1+0 | |
| 320 bsf STATUS,C | |
| 321 btfss W1+1,2 | |
| 322 bcf STATUS,C | |
| 323 rrcf C1+0 | |
| 324 | |
| 325 ; calculate C2 (16Bit) | |
| 326 movff W2+0, C2+0 | |
| 327 bsf STATUS,C | |
| 328 btfss W2+1,0 | |
| 329 bcf STATUS,C | |
| 330 rrcf C2+0 | |
| 331 bsf STATUS,C | |
| 332 btfss W2+1,1 | |
| 333 bcf STATUS,C | |
| 334 rrcf C2+0 | |
| 335 bsf STATUS,C | |
| 336 btfss W2+1,2 | |
| 337 bcf STATUS,C | |
| 338 rrcf C2+0 | |
| 339 bsf STATUS,C | |
| 340 btfss W2+1,3 | |
| 341 bcf STATUS,C | |
| 342 rrcf C2+0 | |
| 343 bsf STATUS,C | |
| 344 btfss W2+1,4 | |
| 345 bcf STATUS,C | |
| 346 rrcf C2+0 | |
| 347 bsf STATUS,C | |
| 348 btfss W2+1,5 | |
| 349 bcf STATUS,C | |
| 350 rrcf C2+0 | |
| 351 | |
| 352 movff W2+1, C2+1 | |
| 353 bsf STATUS,C | |
| 354 btfss W1+0,0 | |
| 355 bcf STATUS,C | |
| 356 rrcf C2+1 | |
| 357 bsf STATUS,C | |
| 358 btfss W1+0,1 | |
| 359 bcf STATUS,C | |
| 360 rrcf C2+1 | |
| 361 bsf STATUS,C | |
| 362 btfss W1+0,2 | |
| 363 bcf STATUS,C | |
| 364 rrcf C2+1 | |
| 365 bcf STATUS,C | |
| 366 rrcf C2+1 | |
| 367 bcf STATUS,C | |
| 368 rrcf C2+1 | |
| 369 bcf STATUS,C | |
| 370 rrcf C2+1 | |
| 371 | |
| 372 ; calculate C3 (16Bit) | |
| 373 movff W3+1,C3+0 | |
| 374 bsf STATUS,C | |
| 375 btfss W3+0,7 | |
| 376 bcf STATUS,C | |
| 377 rlcf C3+0 | |
| 378 bsf STATUS,C | |
| 379 btfss W3+0,6 | |
| 380 bcf STATUS,C | |
| 381 rlcf C3+0 | |
| 382 clrf C3+1 | |
| 383 btfsc W3+1,7 | |
| 384 bsf C3+1,1 | |
| 385 btfsc W3+1,6 | |
| 386 bsf C3+1,0 | |
| 387 | |
| 388 ; calculate C4 (16Bit) | |
| 389 movff W4+1,C4+0 | |
| 390 bsf STATUS,C | |
| 391 btfss W4+0,7 | |
| 392 bcf STATUS,C | |
| 393 rlcf C4+0 | |
| 394 clrf C4+1 | |
| 395 btfsc W4+1,7 | |
| 396 bsf C4+1,0 | |
| 397 | |
| 398 ; calculate C5 (16Bit) | |
| 399 movff W3+0,C5+0 | |
| 400 bcf C5+0,6 | |
| 401 btfsc W2+0,0 | |
| 402 bsf C5+0,6 | |
| 403 bcf C5+0,7 | |
| 404 btfsc W2+0,1 | |
| 405 bsf C5+0,7 | |
| 406 clrf C5+1 | |
| 407 btfsc W2+0,2 | |
| 408 bsf C5+1,0 | |
| 409 btfsc W2+0,3 | |
| 410 bsf C5+1,1 | |
| 411 btfsc W2+0,4 | |
| 412 bsf C5+1,2 | |
| 413 btfsc W2+0,5 | |
| 414 bsf C5+1,3 | |
| 415 | |
| 416 ; calculate C6 (16Bit) | |
| 417 clrf C6+1 | |
| 418 movff W4+0,C6+0 | |
| 419 bcf C6+0,7 | |
| 420 | |
| 421 bcf no_sensor_int ; enable sensor interrupts | |
| 422 return | |
| 423 | |
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424 ;============================================================================= |
| 0 | 425 reset_MS5535A_one: |
| 426 bsf sensor_SDO | |
| 427 nop | |
| 428 bsf sensor_CLK | |
| 429 nop | |
| 430 nop | |
| 431 nop | |
| 432 nop | |
| 469 | 433 btfsc OSCCON,4 ; 32MHz Mode? |
| 434 rcall MS5535A_extra_wait ; Yes | |
| 0 | 435 bcf sensor_CLK |
| 436 return | |
| 437 | |
| 438 reset_MS5535A_zero: | |
| 439 bcf sensor_SDO | |
| 440 nop | |
| 441 bsf sensor_CLK | |
| 442 nop | |
| 443 nop | |
| 444 nop | |
| 445 nop | |
| 469 | 446 btfsc OSCCON,4 ; 32MHz Mode? |
| 447 rcall MS5535A_extra_wait ; Yes | |
| 0 | 448 bcf sensor_CLK |
| 449 return | |
| 450 | |
| 469 | 451 MS5535A_extra_wait: |
| 452 nop | |
| 453 nop | |
| 454 nop | |
| 455 nop | |
| 456 nop | |
| 457 return | |
| 458 | |
| 0 | 459 reset_MS5535A: |
| 460 rcall reset_MS5535A_one ;0 | |
| 461 rcall reset_MS5535A_zero | |
| 462 rcall reset_MS5535A_one | |
| 463 rcall reset_MS5535A_zero | |
| 464 rcall reset_MS5535A_one | |
| 465 rcall reset_MS5535A_zero | |
| 466 rcall reset_MS5535A_one | |
| 467 rcall reset_MS5535A_zero | |
| 468 rcall reset_MS5535A_one | |
| 469 rcall reset_MS5535A_zero | |
| 470 rcall reset_MS5535A_one | |
| 471 rcall reset_MS5535A_zero | |
| 472 rcall reset_MS5535A_one | |
| 473 rcall reset_MS5535A_zero | |
| 474 rcall reset_MS5535A_one | |
| 475 rcall reset_MS5535A_zero ;15 | |
| 476 rcall reset_MS5535A_zero | |
| 477 rcall reset_MS5535A_zero | |
| 478 rcall reset_MS5535A_zero | |
| 479 rcall reset_MS5535A_zero | |
| 480 rcall reset_MS5535A_zero ;20 | |
| 481 return | |
| 482 | |
| 483 get_2bytes_MS5535A: | |
| 484 movlw d'8' | |
| 485 movwf clock_count | |
| 486 rcall recieve_loop | |
| 487 movff isr1_temp,dMSB | |
| 488 | |
| 489 movlw d'8' | |
| 490 movwf clock_count | |
| 491 rcall recieve_loop | |
| 492 movff isr1_temp,dLSB | |
| 493 bsf sensor_CLK | |
| 494 nop | |
| 495 nop | |
| 496 nop | |
| 497 nop | |
| 469 | 498 btfsc OSCCON,4 ; 32MHz Mode? |
| 499 rcall MS5535A_extra_wait ; Yes | |
| 0 | 500 bcf sensor_CLK |
| 501 return | |
| 502 | |
| 503 recieve_loop: | |
| 504 bsf sensor_CLK | |
| 505 nop | |
| 506 nop | |
| 507 nop | |
| 508 nop | |
| 469 | 509 btfsc OSCCON,4 ; 32MHz Mode? |
| 510 rcall MS5535A_extra_wait ; Yes | |
| 0 | 511 bcf sensor_CLK |
| 512 btfss sensor_SDI ;MSB first | |
| 513 bcf STATUS,C | |
| 514 btfsc sensor_SDI ;MSB first | |
| 515 bsf STATUS,C | |
| 516 rlcf isr1_temp,F | |
| 517 decfsz clock_count,F | |
| 518 bra recieve_loop | |
| 519 return | |
| 520 | |
| 521 send_data_MS55535A: | |
| 522 ; send three startbits first | |
| 523 bcf sensor_CLK | |
| 524 bsf sensor_SDO | |
| 525 movlw d'3' | |
| 526 subwf clock_count,F ; total bit counter | |
| 527 bsf sensor_CLK | |
| 528 nop | |
| 529 nop | |
| 530 nop | |
| 531 nop | |
| 469 | 532 btfsc OSCCON,4 ; 32MHz Mode? |
| 533 rcall MS5535A_extra_wait ; Yes | |
| 0 | 534 bcf sensor_CLK |
| 535 nop | |
| 536 nop | |
| 537 nop | |
| 538 nop | |
| 469 | 539 btfsc OSCCON,4 ; 32MHz Mode? |
| 540 rcall MS5535A_extra_wait ; Yes | |
| 0 | 541 bsf sensor_CLK |
| 542 nop | |
| 543 nop | |
| 544 nop | |
| 545 nop | |
| 469 | 546 btfsc OSCCON,4 ; 32MHz Mode? |
| 547 rcall MS5535A_extra_wait ; Yes | |
| 0 | 548 bcf sensor_CLK |
| 549 nop | |
| 550 nop | |
| 551 nop | |
| 552 nop | |
| 469 | 553 btfsc OSCCON,4 ; 32MHz Mode? |
| 554 rcall MS5535A_extra_wait ; Yes | |
| 0 | 555 bsf sensor_CLK |
| 556 nop | |
| 557 nop | |
| 558 nop | |
| 559 nop | |
| 469 | 560 btfsc OSCCON,4 ; 32MHz Mode? |
| 561 rcall MS5535A_extra_wait ; Yes | |
| 0 | 562 bcf sensor_CLK |
| 563 ; now send 8 bytes from isr_temp1 and fill-up with zeros | |
| 469 | 564 databits: |
| 0 | 565 btfss isr1_temp,7 ;MSB first |
| 566 bcf sensor_SDO | |
| 567 btfsc isr1_temp,7 ;MSB first | |
| 568 bsf sensor_SDO | |
| 569 bcf STATUS,C | |
| 570 rlcf isr1_temp | |
| 571 | |
| 572 bsf sensor_CLK | |
| 573 nop | |
| 574 nop | |
| 575 nop | |
| 576 nop | |
| 469 | 577 btfsc OSCCON,4 ; 32MHz Mode? |
| 578 rcall MS5535A_extra_wait ; Yes | |
| 0 | 579 bcf sensor_CLK |
| 580 | |
| 581 decfsz clock_count,F | |
| 469 | 582 bra databits |
| 0 | 583 return |