LCD_E BIT P3.4 LCD_RS BIT P3.5 LCDADDR EQU 6000H ORG 0000H MAIN: MOV @R0,30H MOV DPTR,#LCDADDR ACALL CLEAR ACALL INIT_LCD MOV R0,#1 MOV R1,#0 ACALL GOTOXY MOV R2,#0 RETURN: MOV A,R2 ACALL DISPLAYSTRING2 INC R2 CJNE R2,#8,RETURN MOV R0,#1 MOV R1,#12 ACALL GOTOXY MOV A,#19 ACALL DISPLAYSTRING2 MAIN1: MOV R0,#1 MOV R1,#8 ACALL GOTOXY ACALL READADC ACALL CALADC MOV A,R0 ADD A,#9 ACALL DISPLAYSTRING2 MOV A,#8 ACALL DISPLAYSTRING2 MOV A,R1 MOV B,#10 DIV AB ADD A,#9 ACALL DISPLAYSTRING2 MOV A,B ADD A,#9 ACALL DISPLAYSTRING2 SJMP MAIN1 INIT_LCD: MOV A,#38H ACALL WRITECOM MOV A,#0CH ACALL WRITECOM MOV A,#06H ACALL WRITECOM MOV A,#0C0H ACALL WRITECOM RET CLEAR: MOV A,#01H ACALL WRITECOM RET WRITECOM: MOV DPTR,#LCDADDR SETB LCD_E CLR LCD_RS MOVX @DPTR,A CLR LCD_E ACALL WAIT_LCD RET WRITETEXT: MOV DPTR,#LCDADDR SETB LCD_E SETB LCD_RS MOVX @DPTR,A CLR LCD_E ACALL WAIT_LCD RET WAIT_LCD: MOV R7,#10 L1: MOV R6,#250 DJNZ R6,$ DJNZ R7,L1 RET DISPLAYSTRING2: MOV DPTR,#MESSAGE MOVC A,@A+DPTR ACALL WRITETEXT RET MESSAGE: DB "VOLTAGE 0123456789V" READADC: MOV DPTR,#4000H MOV A,#00H MOVX @DPTR,A ACALL DELAY_ADC MOVX A,@DPTR MOV R0,A RET DELAY_ADC: MOV R5,#100 DJNZ R5,$ RET GOTOXY: CJNE R0,#1,HANG2 MOV A,#80H BACK: ADD A,R1 ACALL WRITECOM RET HANG2: MOV A,#0C0H SJMP BACK CALADC: MOV A,R0 MOV B,#51 DIV AB MOV R0,A MOV A,#5 MUL AB MOV B,#51 DIV AB MOV R1,A MOV A,#5 MUL AB MOV B,#51 DIV AB MOV R2,A MOV A,#5 MUL AB MOV B,#51 DIV AB CJNE A,#5,KHAC KHAC: JC NEXT INC R2 NEXT: MOV A,R1 MOV B,#10 MUL AB ADD A,R2 MOV B,#2 MUL AB MOV R1,A RET END