8279 Display the design and program source code of electronic clock

share to Be Be Be Be You can see how the clock program is designed. Z8279 EQU 08701H 8279 Status / Command Port Address D8279 EQU 08700H 8279 Data Port Address LedMod Equ 00H 八输入八八八显示 ; External decoding key scanning mode, double key interlock LEDFEQ EQU 2FH Scan rate LEDCLS EQU 0C1H Clear Display RAM Ledwr0 EQU 80h ; Set the display RAM address to be written ORG 0000H AJMP START ORG 001BH ; INT T1 entry address AJMP INT_T1 ORG 0040HSTART: Mov sp, # 60h LCALL INIT8279 Initialization 8279 Mov R3, # 0h ;Time Mov r2, # 0h ;Minute Mov r1, # 0h ;second Mov r6, # 0h Sign Mov TMOD, # 10h Mov TL1, # 00H 50 ms time constant Mov TH1, # 04ch MOV R0, # 20 Setb TR1 Setb ET1 Setb EA Allow interrupt Wait: CJNE R6, # 0ffh, wait LCALL Display Mov R6, # 0 SJMP WAIT INIT8279: 8279 Initialization Push DPH Save the site PUSH DPL PUSH ACC LCALL DELAY Delay Mov dptr, # z8279 Mov A, # ledmod 8279 work mode Movx @ DPTR, A Mov A, # ledfeq Key keyboard scan rate Movx @ DPTR, A Mov A, # ledcls Clear LED display Movx @ DPTR, A LCALL DELAY Delay POP ACC Restore the site POP DPL POP DPH RET Show the character subsystem ; Enter R4, Location R5, Value DILD: Push DPH Save the site PUSH DPL PUSH ACC Mov A, # ledwr0 ; Set the display start address Add A, R4 Add position offset Mov dptr, # z8279 Movx @ DPTR, A Set the display location MOV DPTR, # ledseg Settings Display Constant Table Start Location Mov A, R5 MOVC A, @ a + dptr Character Mov dptr, # d8279 Movx @ DPTR, A ;Display Data POP ACC Restore the site POP DPL POP DPH Retdelay: Delay subroutine PUSH 0 Save the site Push 1 MOV 0, # 0hdelay1: Mov 1, # 0h DJNZ 1, $ Djnz 0, Delay1 POP 1 Restore the site POP 0 RET INT_T1: ; Int_t1 interrupt service subroutine Push DPH Protection site PUSH DPL PUSH ACC Push PSW CLR TR1 Mov TL1, # 00H 50ms timing constant Mov TH1, # 4ch Setb TR1 DJNZ R0, EXIT ; Judgment millisecond = 0 MOV R0, # 20 Delay 1 Second Mov r6, # 0ffh 秒秒标 CJNE R1, # 59h, second; judgment second = 59 Mov r1, # 99h CJNE R2, # 59h, minute; judgment = 59 Mov r2, # 99h CJNE R3, # 23h, hour; judgment = 23 Mov R3, # 99hr: Mov A, R3 Add A, # 1 ; Time plus 1 DA A MOV R3, Aminute: Mov A, R2 Add A, # 1 ; DA A MOV R2, ASECOND: Mov A, R1 Add A, # 1 ; Second plus 1 DA A MOV R1, AEXIT: POP PSW Restore the site POP ACC POP DPL POP DPH Reti Interrupt to return Display: Mov A, R3 ANL A, # 0fh MOV R5, A Mov R4, # 6 LCALL DISLED Show an hour to low Mov A, R3 SWAP A ANL A, # 0fh MOV R5, A Mov r4, # 7 LCALL DISLED Show an hour high Mov A, R2 ANL A, # 0fh MOV R5, A Mov r4, # 3 LCALL DISLED Show a minute lower position Mov A, R2 SWAP A ANL A, # 0fh MOV R5, A Mov r4, # 4 LCALL DISLED Show a minute high Mov A, R1 ANL A, # 0fh MOV R5, A Mov R4, # 0 LCALL DISLED Show second low Mov A, R1 SWAP A ANL A, # 0fh MOV R5, A Mov R4, # 1 LCALL DISLED Show the second high RET Ledseg: DB 3FH, 06H, 5BH, 4FH, 66H, 6DH, 7DH, 07H; '0, 1, 2, 3, 4, 5, 6, 7' DB 7FH, 6FH, 77H, 7CH, 39H, 5EH, 79H, 71H; '8, 9, A, B, C, D, E, F' DB 6DH, 02H, 08H, 00h, 59H, 0FH, 76H; 'u, -, _,, i, o, p,' End [1] [2], read the full text