STACK_BUF EQU 60H
F_55 DATA 7EH
F_AA DATA 7FH
;-------------------------------
ORG 0000H
AJMP START
NOP
INT_RET:
RETI
START:
CLR A
MOV IE, A
MOV PSW, A
CPL A
MOV P1, A
MOV P3, A
MOV SP, #(STACK_BUF-1)
ACALL INT_RET
ACALL INT_RET
MOV A, F_55
CPL A
XOR A, F_AA
JNZ CLR_RAM_1
MOV A, #55H
XOR A, F_AA
JZ SKIP_CLR_RAM
CLR_RAM_1:
CLR A
MOV R0, A
CLR_RAM:
MOV @R0, A
DJNZ R0, CLR_RAM
MOV F_55, #55H
MOV F_AA, #0AAH
SKIP_CLR_RAM:
;....
;...
;....
;....
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