电子屏字符显示器

1、*; * *; * 电子屏字符显示器 *; * “电子设计” *; *; 四个显示字符数据表在50H6FH单元内，字符用8*8点阵，R4（30H）用于; 控制显示静止字的时间，R5（31H）静止字显示跳转地址步距，B内放显示首址  ;*;中断入口程序;*;ORG 0000HLJMP STARTORG 0003HRETIORG 000BHRETIORG 0013HRETIORG 001BHRETIORG 0023HRETIORG 002BHRETICLEARMEN: MOV A,#0FFH MOV P1,A MOV P2,A MOV P3,A MOV P0,A MOV DPTR,#TA

2、B CLR A MOV R3,A MOV R1,#50H MOV R2,#20HCLLOOP: MOVC A,A+DPTR START: LCALL CLEARMENSTART1: LCALL KEYWORK KEYWORK: MOV P1,#0FFH JNB P1.0,KEY1 JNB P1.1,KEY2 JNB P1.2,KEY3KEYRET: RETKEY1: LCALL DL10MS JB P1.0,KEYRETWAIT: JNB P1.0,WAIT LCALL CLEARMEN MOV 30H,#80H MOV 31H,#08H LJMP DISP1KEY2: LCALL DL10M

3、S JB P1.1,KEYRETWAIT1: JNB P1.1,WAIT1 LCALL CLEARMEN MOV 30H,#14H MOV 31H,#01H LJMP DISP1KEY3: LCALL DL10MS JB P1.2,KEYRETWAIT2: JNB P1.2,WAIT2 LCALL CLEARMEN LJMP DISP2DISP1: MOV B,#50H MOV R4,30H MOV R5,31HLOOP: LCALL DISPLAY DJNZ R4,LOOP MOV R4,30H MOV A,B CJNE A,#68H,CONT AJMP DISP1CONT: ADD A,R

4、5 MOV B,A AJMP LOOPDISPLAY: MOV A,#0FFH MOV P0,A MOV P2,A MOV R6,#0FEH MOV R0,B MOV R7,#08HDISLOOP: MOV A,R0 MOV P0,A MOV P2,R6 LCALL DL1MS INC R0 MOV A,R6 RL A MOV R6,A DJNZ R7,DISLOOP RETDISP2: LCALL DISPP LCALL MOVH LCALL MOVH1 AJMP DISP2DISPP: MOV B,#50H MOV R4,#24H LCALL DISPLAY DJNZ R4,DISPP R

5、ETMOVH: MOV R1,#20H MOV R0,#50H MOV R2,#08HMOV1: MOV A,R0 CLR C RLC A MOV R0,A MOV A,R1 RRC A MOV R1,A INC R0 DJNZ R2,MOV1 MOV R2,#08H INC R1 MOV A,R1 SUBB A,#24H JZ OUT AJMP MOV1OUT: RETMOVH1: MOV A,20H XCH A,23H XCH A,22H XCH A,21H MOV 20H,A MOV R1,#20H MOV R0,#50HMOV2: MOV A,R0 RR A MOV R0,A MOV

6、A,R1 CLR C RRC A MOV A,R0 RLC A MOV R0,A INC R0 DJNZ R2,MOV2 MOV R2,#08H INC R1 MOV A,R1 SUBB A,#24H JZ OUT AJMP MOV2DL1MS: MOV R3,#64H ;100*（8+2）usLOOPK: LCALL KEYWORK DJNZ R3,LOOPK RETDL512: MOV R2,#0FFHLOOP1: DJNZ R2,LOOP1 RETDL10MS: MOV R3,#14HLOOP2: LCALL DL512 DJNZ R3,LOOP2 RETTAB: DB 0EFH,83H,0ABH,83H,0ABH,83H,0EEH,0E0H ; 电 DB 0FFH,0C7H,0EFH,83H,0EFH,0EFH,0CFH,0EFH ; 子 DB 0B1H,0B5H