Using timers to achieve long delays-EEWORLD

;Key points: Application of counters

; Set the timer to 50ms, and set two software counters to 20 and 60 for the total time

; 50ms*20*60=60000ms=1 minute

; t1 is mode 1, then m1m0=01h, use timer c/t=0 gate=0 TMOD=10H

; Mode 1 is a 16-bit counter, a total of 65535, minus 50000 equals 15536, so the initial value of the counter is 3cb0h

ORG 0000H; program starts

LJMP MAIN

ORG 030H

MAIN: MOV 30H, #20; 30h, 31h set constants 20, 60 respectively

MOV 31H,#60;

MOV TMOD,#10H;Timer mode 1

MOV TH1,#03CH; Set the timer initial value

MOV TL1,#0B0H

MOV IE,#00H; Disable interrupts

SETB TR1; Start timer

LOOP: JBC TF1, LOOP1; query timer time is up and switch to loop1

AJMP LOOP

LOOP1: MOV TH1,#03CH; reset timer

MOV TL1,#0B0H

DJNZ 30H,LOOP; Is the timing reached 20 times?

MOV 30H,#20

DJNZ 31H, LOOP; Is the timing up to 60 times?

MOV 31H,#60

CPL P1.0; invert p1.0

AJMP LOOP

END

The status of the program running in the Yitian version: the program is completely destroyed after running

The program is running in the Yitian version: p10 lights up after 1 minute, achieving a long delay

Reference address：Using timers to achieve long delays

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