read_1820.s

嵌入式Linux应用系统开发实例精讲源代码

READ_1820:
MOV R4,#9
MOV R1,#60H 		; 存入60H开始的九个单元
RE00:
MOV R2,#8
RE01:
CLR C
SETB WDDATA
NOP
NOP
CLR WDDATA
NOP
NOP
NOP
SETB WDDATA
MOV R3,#09
RE10:
DJNZ R3,RE10
MOV C,WDDATA
MOV R3,#23
RE20:
DJNZ R3,RE20
RRC A
DJNZ R2,RE01
MOV @R1,A
INC R1
DJNZ R4,RE00
RET