shuzi.asm

数字电压器

	CH        EQU 30H 
	DPCNT     EQU 31H 
	DPBUF     EQU 33H 
	GDATA     EQU 32H 
	ST         BIT P3.0 
	OE         BIT P3.1 
	EOC        BIT P3.2 
                   
		ORG 00H 
                LJMP START 
                ORG 0BH 
                LJMP T0X 
                ORG 30H 
START:      	MOV CH,#0BCH 
                MOV DPCNT,#00H 
                MOV R1,#DPCNT 
                MOV R7,#5 
                MOV A,#10 
                MOV R0,#DPBUF 
LOP: MOV @R0,A 
                   INC R0 
                   DJNZ R7,LOP 
                   MOV @R0,#00H 
                   INC R0 
                   MOV @R0,#00H 
                   INC R0 
                   MOV @R0,#00H 
                   MOV TMOD,#01H 
                   MOV TH0,#(65536-4000)/256 
                   MOV TL0,#(65536-4000) MOD 256 
                   SETB TR0 
                   SETB ET0 
                   SETB EA 
WT:            CLR ST 
                   SETB ST 
                   CLR ST 
WAIT:        JNB EOC,WAIT 
                   SETB OE 
                   MOV GDATA,P0 
                   CLR OE 
                   MOV A,GDATA 
                   MOV B,#100 
                   DIV AB 
                   MOV 33H,A 
                   MOV A,B 
                   MOV B,#10 
                   DIV AB 
                   MOV 34H,A 
                   MOV 35H,B 
                   SJMP WT 
T0X: NOP 
                   MOV TH0,#(65536-4000)/256 
                   MOV TL0,#(65536-4000) MOD 256 
                   MOV DPTR,#DPCD 
                   MOV A,DPCNT 
                   ADD A,#DPBUF 
                   MOV R0,A 
                   MOV A,@R0 
                   MOVC A,@A+DPTR 
                   MOV P1,A 
                   MOV DPTR,#DPBT 
                   MOV A,DPCNT 
                   MOVC A,@A+DPTR 
                   MOV P2,A 
                   INC DPCNT 
                   MOV A,DPCNT 
                   CJNE A,#8,NEXT 
                   MOV DPCNT,#00H 
NEXT:       RETI 
DPCD:       DB 3FH,06H,5BH,4FH,66H 
                   DB 6DH,7DH,07H,7FH,6FH,00H 
DPBT:       DB 0FEH,0FDH,0FBH,0F7H 
                   DB 0EFH,0DFH,0BFH,07FH 
                   END