MCU Timer (more accurate Mode 1 operation)-EEWORLD

Collect

; Let the LED light change every R1ms

COUNT EQU 9217; for a crystal oscillator of 11.0592, 9217 is equivalent to 10ms
LED EQU P1.1

  ORG 0000H
  MOV R0,#00H
  DJNZ R0,$
  MOV R1,00H ;When using R1 as the overall count, use
  MOV SP,#60H
  MOV R1,#00H

  //MOV A,TMOD
  //ANL A,#11110000B
  //CLR ACC.3
  //CLR ACC.2
  //CLR ACC.1
  //SETB ACC.0
  //MOV TMOD,A
  MOV TMOD,#00000001B ; The above expression can be replaced by this, which is more concise

  MOV TH0,#(65536-COUNT)/256
  MOV TL0,#255
  CLR TF0
  SETB TR0

LOOP: JNB TF0,LOOP
;
OVER: CLR TF0
MOV TH0,#(65536-COUNT)/256
MOV TL0,#255

  INC R1
  MOV A,R1
  CJNE R1,#5,NEXT ;If it does not reach 50ms, it will continue to accumulate timing
  CPL LED
  MOV R1,#00H ;Re-install the initial value
NEXT: AJMP LOOP ;After reaching 50ms, the light will be reversed and the timing will start again

END

Keywords：MCU Timer Reference address：MCU Timer (more accurate Mode 1 operation)

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