汇编AT24C02-一个字节程序段

定义引脚 SDA BIT P3 3 SCL BIT P3 2 ORG 0000H MAIN MOV 30H 25H 存想存的数字 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 P1 0 CALL DELAY 显示延时 SETB P1 0 ANL 32H 0FH MOV A 32H MOV DPTR TAB1 MOVC A A DPTR MOV P0 A CLR P1 1 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 的程序段 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 读 24c02 R24C02 CALL START 读 AT24c02 程序段 MOV A 0A0H CALL WBYTE CALL ACK MOV A 0 CALL WBYTE CALL ACK CALL START MOV A 0A1H CALL WBYTE CALL ACK CALL RBYTE CALL NACK CALL STOP RET WBYTE MOV R7 8 写程序段 WLOOP RLC A JC WLOOP2 CLR SDA SETB SCL NOP NOP NOP NOP CLR SCL DJNZ R7 WLOOP RET WLOOP2 SETB SDA SETB SCL NOP NOP NOP NOP CLR SCL CLR SDA DJNZ R7 WLOOP RET RBYTE MOV R7 8 读 02 程序段 RLOOP SETB SDA SETB SCL MOV C SDA MOV A 32H RLC A MOV 32H A CLR SCL DJNZ R7 RLOOP RET START SETB SDA 复位程序段 SETB SCL NOP NOP NOP NOP CLR SDA NOP NOP NOP CLR SCL NOP RET STOP CLR SDA SETB SCL NOP NOP NOP NOP SETB SDA NOP NOP NOP NOP CLR SCL NOP NOP RET ACK CLR SDA 响应程序段 应答程序 NOP SETB SCL NOP NOP NOP NOP CLR SCL NOP NOP RET