ORG 000BH
MOV A_BAK1, TL0
JNB A_BAK1.0, L20
AJMP L21
;-----------------------------
;.............
;.............
;------------------
L20:
SETB A_BAK1.0
L21:
XCH A, A_BAK1
XRL A, #00001111B
RR A ; * 1/2
JZ L21
DJNZ ACC, $
L21:
;----------------------
MOV TH0, TH0_2
MOV TL0, TL0_2
MOV A, A_BAK1
ACALL INT_RET
PUSH PSW
MOV A_BAK2, A
;.....
;.....
MOV TH0_2, A
;.....
;.....
MOV TL0_2, A
MOV A, A_BAK2
POP PSW
RET
INT_RET:
RETI
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