51 MCU: Key-controlled DC motor-EEWORLD

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Title: Use AT89C51 microcontroller assembly language to write a program to control the forward and reverse rotation of the motor

The button of P3.0 is used to control the forward rotation.

The button of P3.1 is to control the inversion

The button of P3.2 is to stop

Write it in the shortest possible assembly language, and explain it sentence by sentence if possible. I won't use interrupts.

The circuit is as follows:

51 MCU: Key-controlled DC motor - Non-famous blogger - Electronic Information Corner

For such a simple problem, there is no need to use interrupts.

The program written by Dao is as follows:

;DC motor control

ORG 0000H

P30:JB P3.0, P31; Detection button

CALL DELAY ; Delay

JB P3.0, P31 ; Anti-shake

JNB P3.0, $ ; Waiting for release

MOV P2, #01H ;Forward

;------------------------

P31:JB P3.1, P32; take turns to test

CALL DELAY

JB P3.1, P32

JNB P3.1, $

MOV P2, #02H ; reverse

;------------------------

P32:JB P3.2, P30

CALL DELAY

JB P3.2, P30

JNB P3.2, $

MOV P2, #03H ;Stop

SJMP P30

;------------------------

DELAY: ; Delay about 10ms (fosc = 6MHz)

MOV R6, #10

DJNZ R7, $

DJNZ R6, $ - 2

RET

;------------------------

END

;------------------------

Comment from the questioner: I thank the great god, grateful

postscript:

This program is written as: short and powerful, fully functional, and works extremely fast, not inferior to the method of using interrupts.

Reference address：51 MCU: Key-controlled DC motor

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