汇编AT24C02一个字节程序段样稿.doc

;定义引脚
SDA BIT
SCL BIT
ORG 0000H

MAIN: MOV 30H,#25H ;存想存数字
MOV 31H,#34H
MOV R1,30H
LL: MOV B,R1
CALL W24C02 ;写入24c02
CALL R24C02 ;读出24c02
CALL DISPLAY ;显示数字
INC R1
JMP LL
;**************************** 显示 *************************************************
DISPLAY:
MOV A,32H
ANL A,#0F0H
SWAP A
MOV DPTR,#TAB1
MOVC A,***@A+DPTR
MOV P0,A
CLR
CALL DELAY ;显示延时
SETB
ANL 32H,#0FH
MOV A,32H
MOV DPTR,#TAB1
MOVC A,***@A+DPTR
MOV P0,A
CLR
CALL DELAY ;显示延时
RET
TAB1: DB 0C0H,0F9H,0A4H,0B0H,099H,092H,082H,0F8H,080H,090H
RET
DELAY: MOV R7,#14H ;延迟子程序
DLY: MOV R6,#0F8H
DLY1: DJNZ R6 ,DLY1
DJNZ R7 ,DLY
RET
;******************************* 写入24c02**********************************************
W24C02: CALL START ;写入AT24C02程序段
MOV A,#0A0H
CALL WBYTE
CALL ACK
MOV A,#0
CALL WBYTE
CALL ACK
MOV A,B
CALL WBYTE
CALL ACK
CALL STOP
CALL S005
RET
S005: MOV R7,#10 ;延时程序段
S0051: MOV R6,#248
DJNZ R6,$
DJNZ R7,S0051
RET
; *********************