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annotate src/isr.inc @ 608:d866684249bd

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work on 2.99 stable
author heinrichsweikamp
date Mon, 07 Jan 2019 21:13:43 +0100
parents ca4556fb60b9
children c40025d8e750
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1 ;=============================================================================
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2 ;
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3 ; File isr.inc
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4 ;
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5 ;
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6 ; Copyright (c) 2011, JD Gascuel, HeinrichsWeikamp, all right reserved.
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7 ;=============================================================================
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8 ; HISTORY
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9 ; 2011-08-06 : [mH] moving from OSTC code
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10
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11 SAFE_2BYTE_COPY MACRO from,to
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12 local retry
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13 retry:
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14 movff from+1,WREG ; high byte in WREG, ...
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15 movff WREG,to+1 ; ... and destination
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16 movff from+0,to+0 ; copy low byte
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17 movff from+1,TABLAT ; another bank-safe read
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18 xorwf TABLAT,W ; did the high byte changed?
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19 bnz retry ; YES - retry
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20 ENDM