It is required to use timer/counter 1 for timing, with a timing of 1 second; timer/counter 0 for counter, and the external pulse to be counted is connected from P3.4 (T0).
The microcontroller will count the pulses within 1 second and send them to the four-digit digital tube for display. The maximum count display value is 0FFFFH.
Request a program.
;==============================================
Best answer: This is a simple frequency meter. The program is as follows:
;---------------------------------
ORG 0000H
JMP START
ORG 000BH
JMP T0_INT
;---------------------------------
START:
MOV TMOD, #51H ;/*01010001 T1 counting, T0 timing*/
MOV TH0, #HIGH(65536 - 50000) ;50ms@12MHz
MOV TL0, #LOW (65536 - 50000)
MOV TH1, #0
MOV TL1, #0
SETB TR0
SETB TR1
SETB ET0
SETB EA
MOV R7, #20
SJMP $
;---------------------------------
T0_INT: ;Execute once every 50ms
MOV TL0, #LOW (65536 - 50000) ;Rewrite the initial value
MOV TH0, #HIGH(65536 - 50000) ;50ms@12MHz
DJNZ R7, T0_END
MOV R7, #20
MOV P1, TL1
MOV P2, TH1
MOV TL1, #0
MOV TH1, #0
T0_END:
RETI
;---------------------------------
END
The simulation with PROTEUS is as shown below.
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Next article：Use T1 timing to output square waves with periods of 2ms and 500 microseconds at the P1.0 and P1.1 pins respectively.
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