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【正文】 OV R4,03H ACALL CHANGE LCALL HUANSUANCC1: MOV A,54H CJNE A,01H,CC2 MOV A,55H ADD A,10 MOV 55H,A MOV R5,12 MOV R4,02H ACALL CHANGE MOV R5,12 MOV R4,03H ACALL CHANGE LCALL HUANSUANCC2: MOV A,54H CJNE A,02H,CC3 LCALL JIESOUCC3: MOV A,54H CJNE A,03H,KEYSHOW MOV R5,12 MOV R4,02H ACALL CHANGE MOV R5,10 MOV R4,03H ACALL CHANGE LCALL FASONG LCALL HUANSUAN LJMP KEYSHOWSJMP $。置高優(yōu)先級(jí)或者低優(yōu)先級(jí) CLR IE0 。M2T1板數(shù)碼管對(duì)應(yīng)表TTA: MOV DPTR,TAB_A MOVC A,A+DPTR RET。6 DB 00EH。r DB 070H。命令開(kāi)始,此命令可以放在后面 MOV R7,08H 。送出一位數(shù)據(jù) SETB CH451_DCLK 。忽略 12 位命令的低 8 位 CH451_READ_4: RRC A 。讀入一位數(shù)據(jù) CLR CH451_DCLK 。將要在第幾位上顯示放在R4中，最右邊是0位 2013 LCALL CHANGE MOV R5,51H 。判斷是否正確 CLR RI MOV A,SBUF CJNE A,0AAH,NO1 MOV SCON,40H RET。將要在第幾位上顯示放在R4中，最右邊是0位 2013 LCALL CHANGE MOV A,56H 。第幾個(gè) MOV B,10 DIV AB MOV 51H,A MOV 50H,B MOV R5,50H MOV R4,02H LCALL CHANGE1 MOV R5,51H MOV R4,03H LCALL CHANGE LCALL DELAY LJMP Q3Q2: MOV 57H,00H RETI 。**************************************************************************** LIUSHUI: MOV R5,15 MOV R4,00H LCALL CHANGE MOV R5,15 MOV R4,01H LCALL CHANGE MOV R5,13 MOV R4,02H LCALL CHANGE MOV R5,16 MOV R4,03H LCALL CHANGE LCALL DELAY MOV R5,0 MOV R4,00H LCALL CHANGE MOV R5,15 MOV R4,01H LCALL CHANGE MOV R5,15 MOV R4,02H LCALL CHANGE MOV R5,13 MOV R4,03H LCALL CHANGE RET。接收反碼 CLR RI MOV A,SBUF XRL A,56H CJNE A,0FFH,CHUO LJMP DUI1CHUO: MOV SBUF,055H JNB TI,$ CLR TI MOV R5,14 MOV R4,00H LCALL CHANGE MOV R5,13 MOV R4,01H LCALL CHANGE LJMP CHONGDUI1: MOV SBUF,0AAH JNB TI,$ CLR TI MOV A,56H MOV B,0AH DIV AB MOV 51H,A MOV 50H,B MOV R5,50H 。**************************************************************************** FASONG: MOV SCON,50HBUXU: MOV SBUF,08AH 。清中斷標(biāo)志,讀操作過(guò)程中有低電平脈沖 SETB EX0 。位數(shù)據(jù)未完繼續(xù) SETB CH451_LOAD 。允許鍵盤(pán)中斷 RET CH451_READ: CLR EX0 。產(chǎn)生時(shí)鐘上升沿通知 CH451
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鄂ICP備17016276號(hào)-1