|
ORG 0000H; JMP MAIN; ORG 0003H; JMP INP0; ORG 0030H; /*键盘所输入数字依次存入70H-77H*/ MAIN: MOV R6, #70H; MOV SP, #60H; CLR 80H; CLR 81H; SETB EA; SETB EX0; SETB IT0; DISP1: MOV R0, #70H;//从第一位地址存数 MOV R2, #01H;//位选第一位 DISP2: MOV A, @R0; LCALL SEG7; //跳转段码 MOV P0, A; //P0输出字形 MOV P2, R2; //位选输出 LCALL D1MS; //跳转延时 MOV P2, #0; //位选关闭，段码不输出 INC R0; //选择下一位； MOV A, R2; CLR C; //进位标志清零 RLC A; //扫描字右移 MOV R2, A; //保存扫描字 JNC DISP2; //C=0时， 循环一次未结束，跳转到DISP2 PASS: LJMP DISP1; D1MS: MOV R7, #50H;//延时程序 DMS: DJNZ R7, DMS; RET; SEG7: MOV DPTR, #TABLE;//查表程序 MOVC A, @A+DPTR; RET; TABLE: DB 0C0H, 0F9H, 0A4H, 0B0H; DB 99H, 92H, 82H, 0F8H; DB 80H, 90H, 88H, 83H; DB 0C6H, 0A1H, 86H, 8EH; /*P3.6-3.7，行线； P1.0-1.7，列线；*/ /*P0，输出字形； P2，输出位选*/ INP0: PUSH ACC; PUSH B; PUSH PSW; START: MOV R4, #00H; L1: MOV R3, #0F7H;//设扫描初值，11110111，P3.3=0 MOV R1, #00H; //取码指针； /*首先行扫描*/ L2: MOV A, R3; //行扫描开始 MOV P1, A; //扫描值输出至p1 MOV A, P1; //读入P1的值 MOV R4, A; //P3口中P3.4-3.7的状态通过A，传送到R4 SETB C; //进位标志置1 MOV R5, #04H; // l3: RLC A; //按键左移，通过C是否为0，判断此列是否有0；无0则r1进行累加；有0跳转到延时， JNC KEY; //C=0，跳转到延时 INC R1; DJNZ R5, L3; MOV A, R3; SETB C; RRC A; //换行扫描 MOV R3,A; JC L2; //C=1，跳转到L2 KEY: ACALL DELAY; D1: MOV A,P1; XRL A,R4; JNZ D1; MOV A, R6; //指定存入地址 MOV R0, A; MOV A, R1; //存入数字 MOV @R0, A; /*判断运算法*/ MOV A, R1; XRL A, #0AH;//判断是否为加法符 JZ ADD1; MOV A, R1; XRL A, #0BH;//判断是否为减法符 JZ SUBB1; MOV A, R1; XRL A, #0CH;//判断是否为乘法符 JZ MUL1; MOV A, R1; XRL A, #0DH;//判断是否为除法符 JZ DIV1; MOV A, R1; XRL A, #0EH;//判断是否为等于号 JZ EQUAL1; MOV A, R1; XRL A, #0FH;//判断是否为清零键 JZ ON1; INC R0; //选择下一个地址 MOV A, R0; //存入r0的新数值 MOV R6, A; POP PSW; POP B; pop ACC; RET; DELAY: MOV R7, #60;//消除抖动延时程序 DLY1: DJNZ R7, DLY1; RET; ADD1: MOV A, 80H; //加法程序 MOV 81H, A; LJMP D1; MOV A, 81H; ADD A, 80H; MOV 80H, A; RET; SUBB1: MOV A, 80H;//减法程序 MOV 81H, A; LJMP DD1; MOV A, 80H; SUBB A, 81H; MOV 80H, A; RET; MUL1: MOV A, 80H;//乘法程序 MOV 81H, A; LJMP DD1; MOV A, 80H; MUL AB; MOV 80H, A; RET; DIV1: MOV A, 80H;//除法程序 MOV 81H, A; LJMP DD1; MOV A, 80H; DIV AB; MOV 80H, A; RET; EQUAL1: MOV A, 80H;//等于程序 MOV B, #64H;//算百位数 DIV AB; MOV 72H, A; //将此数除100，商数放72h，余数放71h。 MOV 71H, B; MOV A, 71H; MOV B, 0AH;//算十位数 DIV AB; MOV 71H, A; //将此数除10，商数放71h，余数放70h。 MOV 70H, B; RET; ON1: CLR 70H; //清零程序 CLR 71H; CLR 72H; CLR 73H; CLR 78H; CLR 79H; CLR 7AH; CLR 80H; CLR 81H; CLR 82H; CLR 88H; CLR 89H; CLR 8AH; MOV R0, 00H; MOV R1, 00H; MOV R2, 00H; MOV R3, 00H; MOV R4, 00H; MOV R5, 00H; MOV R6, 70H; MOV R7, 00H; RET; DD1: MOV B, #0AH;//将所输入两位数转换为十进制，并存入80h中 MOV A, 78H; MUL AB; ADD A, 70H; MOV 80H, A; RET; END;
|
QQ好友和群
QQ空间
腾讯微博
腾讯朋友
收藏
淘帖
顶
踩
