ch451实现按键显示（国外英文资料）.doc

ch451实现按键显示（国外英文资料） CH451_DCLK BIT P1.7; Serial data clock, rising edge activation CH451_DIN BIT P1.6; Serial data output, CH451 data entry CH451_LOAD BIT P1.5; Serial command load, uplift edge activation CH451_DOUT BIT P1.4; INT0, keyboard interrupt and key-value data input, and CH451 data output CH451_KEY DATA 7FH; Store the key values read in the keyboard interrupt ; * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ; R452 367 1 ORG 0000 h START: ACALL CH451_INIT; Invoke the initializer MOV R5, # 00H; The number to display is in R5 MOV R4, # 00H; The first place to display is in R4, and the most right is 0 bit 2013 MOV 50 h, R5 ACALL CHANGE MOV R5, # 01H; The number to display is in R5 MOV R4. The first place to display is in R4, and the most right is 0 bit 2013 MOV 51 h and R5 ACALL CHANGE MOV R5, # 02H; The number to display is in R5 MOV R4, # 02H; The first place to display is in R4, and the most right is 0 bit 2013 MOV 52 h, R5 ACALL CHANGE MOV R5. The number to display is in R5 MOV R4. The first place to display is in R4, and the most right is 0 bit 2013 MOV 53 h, R5 ACALL CHANGE KEYSHOW: ACALL SCAN1 MOV A, R4 CJNE R4, # 00 h, CC1 INC 50 h MOV R5, 50 h AJMP TTEES CC1: CJNE R4, # 01H, CC2 51 h INC. MOV R5, 51 h AJMP TTEES CC2: CJNE R4, # 02H, CC3 INC 52 h MOV R5, 52 h AJMP TTEES CC3: CJNE R4, # 03H, KEYSHOW 53 h INC. MOV R5, 53 h AJMP TTEES TTEES: MOV A, R5 TTEESEE: CJNE A, # 00H, QWER1 AJMP TTEESE QWER1: CJNE A, # 01H, QWER2 AJMP TTEESE QWER2: CJNE A, # 02H, QWER3 AJMP TTEESE QWER3: CJNE A, # 03H, QWER4 AJMP TTEESE QWER4: CJNE A, # 04H, QWER5 AJMP TTEESE QWER5: CJNE A, # 05H, QWER6 AJMP TTEESE QWER6: CJNE A AJMP TTEESE QWER7: CJNE A AJMP TTEESE QWER8: CJNE A AJMP TTEESE QWER9: CJNE A, # 09H, QWER0 AJMP TTEESE QWER0: SUBB A, # 10 AJMP TTEESEE TTEESE: MOV R5, a. ACALL CHANGE SJMP KEYSHOW SJMP $ ; * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *