现急需由51单片机控制，273锁存控制7段数码管显示子程序，P2口控制位选共四个数码管显示红绿灯的时间 51单片机控制7段数码管显示

2020-10-05知识8

求分51单片机控制七段数码管显示的时钟电路和程序 KEYVAL EQU 30HKEYTM EQU 31HKEYSCAN EQU 32HDAT EQU 33HSCANLED EQU 39HCLK EQU 77HSEC EQU 78HMIN EQU 79HHOUR EQU 7AHPAUSE BIT 00HDOT BIT 01HORG 0000HLJMP MAINORG 000BHLJMP T0ISR；50ms定时ORG 001BHLJMP T1ISR；扫描显示ORG 0030HMAIN：MOV SP，#5FHMOV TMOD，#11HMOV TH0，#03CHMOV TL0，#0B0HMOV TH1，#0ECHMOV TL1，#078HMOV KEYVAL，#0MOV SCANLED，#0MOV 33H，#10HMOV 34H，#10HMOV 35H，#10HMOV 36H，#10HMOV 37H，#10HMOV 38H，#10HMOV SEC，#0MOV MIN，#0MOV HOUR，#0MOV CLK，#0CLR PAUSESETB EASETB ET1SETB TR1LOOP：LCALL KEYSELMOV A，KEYVALCJNE A，#0FFH，LOOP1SJMP LOOPLOOP1：CJNE A，#10，LOOP2；“ON”启动SETB TR0SETB ET0SETB PAUSESJMP LOOPLOOP2：CJNE A，#11，LOOP3；“=”清零MOV SEC，#0MOV MIN，#0MOV HOUR，#0LCALL DISCHGSJMP LOOPLOOP3：CJNE A，#15，LOOP4；“+”暂停CLR TR0CLR ET0CLR PAUSESJMP LOOPLOOP4：CJNE A，#14，LOOP5；“-”清显示暂停MOV 33H，#10HMOV 34H，#10HMOV 35H，#10HMOV 36H，#10HMOV 37H，#10HMOV 38H，#10HCLR TR0CLR ET0CLR PAUSESJMP LOOPLOOP5：CJNE A，#10，LOOP6；。