【正文】 **************************proc key_3key_3:mov dptr,led_ord_3mov a,key_power 。al2 timerjb flash_f ,set_312inc al2_hour_tmov a,al2_hour_tcjne a,20d ,set_322mov al2_hour_t,00hset_322: sjmp set_342 set_312: inc al2_hourmov a,al2_hourcjne a,20d ,set_342mov al2_hour,00hset_342: ajmp led_jmp_5_endled_k5_2: 。*******************************min to ledMOV B,10DDIV ABmov led2,amov a,bmov led1,a。4db 01110110B。程序參數(shù)保護(hù)PUSH b 。pop acc 。下載燒寫文件的方法：將鼠標(biāo)移到燒寫文件的超級(jí)鍵連處，點(diǎn)擊鼠標(biāo)的右鍵，選擇“目標(biāo)另存為（A）...”保存文件類型中不要選擇“文本文件”，應(yīng)該選擇“所有文件”，這樣就能獲得*.hex文件了。t1_n11: jc t1_n12 。********************************timer_1ms:push bmov r2,01ha_1: mov b,020hb_1: djnz b,b_1djnz r2,a_1pop bret。0 bafgecdhdb 10000100B。al3 timerjb flash_f ,led_m13mov a,al3_min_tmov r7,al3_hour_tsjmp led_m23led_m13:mov a,al3_minmov r7,al3_hourled_m23:acall timer_led1ajmp led_jmp_5_endled_k7_2: 。 nopajmp led_jmp_5_endled_k1_2: 。no key ajmp key_1_endkey_k1_0: 。mov al2_min_t ,al2_min。SETB ET1 。MOV R0,A 。sJMP start ORG 0003H。定時(shí)50毫秒標(biāo)志位timer_1s bit 01h。************************************************** al1_min equ timers+1hal1_hour equ timers+2hal2_min equ timers+3hal2_hour equ timers+4hal3_min equ timers+5hal3_hour equ timers+6hflash equ timers+7h。 LED顯示：【OFF】，K3按下則關(guān)機(jī)。三、軟件編制（軟件流程見圖三）關(guān)機(jī)后數(shù)據(jù)不丟失。多功能AT89C2051倒計(jì)時(shí)器計(jì)時(shí)精度高：3．.獨(dú)立的三路輸出：a:第1路 蜂鳴器輸出： 15Sb:第2路 PNP晶體管輸出：5Sc:第3路 PNP晶體管輸出：直致關(guān)機(jī)二、工作原理****************************************************************del1 equ flash+1hdel2 equ flash+2hdel3 equ flash+3h 。定時(shí)1秒標(biāo)志位timer_3s bit 03h。 。djnz r7,cr 。mov al3_min_t ,al3_min。 key_3 acall key_3ajmp key_1_endkey_k2_0: 。 al1 way off/onajmp led_jmp_5_endled_k2_2: 。 turn off/onmov led3,00hmov led2,0bh。1db 11011010B。******************。 setb timer_1st1_n1: djnz timers ,t1_end_2 mov timers,tisinc time_led3mov a,time_led3cjne a,03d,t1_secmov time_led3,00hcpl timer_3s t1_sec: inc secmov a,seccjne a,60d ,t1_endmov sec,00djnb al1_f ,t1_al1mov a,al1_min_tmov b,al1_hour_tmov c ,aal1_facall al_allmov al1_min_t,amov al1_hour_t,bmov aal1_f,ct1_al1:jnb al2_f ,t1_al2mov a,al2_min_tmov b,al2_hour_tmov c ,aal2_facall al_allmov al2_min_t,amov al2_hour_t,bmov aal2_f,ct1_al2:jnb al3_f ,t1_al3mov a,al3_min_tmov b,al3_hour_tmov c ,aal3_facall al_allmov al3_min_t,amov al3_hour_t,bmov aal3_f,ct1_al3:T1_END: t1_end_1:。 相關(guān)鍵連：AT89C2051的智能時(shí)鐘相關(guān)鍵連：MEAPC可自編程嵌入式控制器相關(guān)鍵連：AT89C2051的倒計(jì)時(shí)器。*******have 5 ordermov tl1 ,amov a,tihaddc a, th0mov th1,amov th0,00hmov tl0,00hsetb tr1 pop pswpop b 。******************T1: setb tr0PUSH ACC 。3db 10110100B。led_bled_jmp_5_end: acall ledretendtimer_led1:。al2 way off/onajmp led_jmp_5_endled_k4_2: 。 key_1 inc key_powermov a,key_powercjne a,08h ,io_1mov key_power,01hio_1: ajmp key_1_end。mov beep_timer,8dmov del1,00dmov del2,00dmov del3,00dmov del4,00dmov key_power,01dsetb al_out_fsetb tr1setb easetb timer_50m