ATM13
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ATM13 - Board
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MOV DPTR,#TAB tens: MOV P0,#00000010B MOV R5,#01H units: MOV R3,#00H next: MOV A,R3 MOVC A,@A+DPTR MOV P0,A ACALL delay INC R3 CJNE R3,#10D,next MOV A,R5 MOVC A,@a+dptr MOV P2,A INC R5 CJNE R5,#11D,again SJMP tens again: SJMP units delay: MOV R2,#06D temp2: MOV R1,#255D temp1: MOV R0,#255D DJNZ R0,$ DJNZ R1,temp1 DJNZ R2,temp2 RET TAB: DB 01000010B ;0x02 0D DB 10011111B ;0x9F 1D DB 00100100B ;0x24 2D DB 00001100B ;0x1C 3D DB 10011000B ;0x98 4D DB 01001000B ;0x48 5D DB 01000000B ;0x40 6D DB 00011110B ;0x1E 7D DB 00000000B ;0x00 8D DB 00001000B ;0x0F 9D END <source lang="cpp"> //2 Digit 7-Segment Up Down Counter Project using 8051 Microcontroller //https://electronicswork.wordpress.com/2012/10/10/2-digit-7-segment-up-down-counter-project-using-8051-microcontroller/ #include <at89x51.h> #define h P3_2 //up counter button #define g P3_3 //down counter button int m=0; int n=0; int a,b; int arr[10]={0x21,0x7D,0x13,0x19,0x4D,0x89,0x81,0x3D,0x01,0x09}; void main() { P2=0x21; P0=0x21; while(1) { P3=0xFF; if(h==0) { if(n==99&&m==99) { P2=0x67; P0=0x67; } else { m=m+1; n=n+1; a=m/10; b=n%10; P2=arr[a]; P0=arr[b]; while(h==0); } } if(g==0) { if(n==0&&m==0) { P2=0x3F; P0=0x3F; } else { m=m-1; n=n-1; a=m/10; b=n%10; P2=arr[a]; P0=arr[b]; while(g==0); } } } }