51 MCU software program reset-EEWORLD

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51 MCU software reset assembly code

POP ACC; pop return address

POP ACC
; Pop up PC

MOV SP,#30H ; After reset, SP is 07H, which will reset the stack
MOV PSW,#00H ; Clear register

CLR A ; push 0 as new

PUSH ACC ; return address to stack
PUSH ACC
; Reset PC=0 and push it into the stack

RETI ; execute return of interrupt

; The program starts running from 0000H again, but the value in the register is uncertain!

Implementing software reset with C51

Method 1:

void(*SoftReset)();

SoftReset=0;

SoftReset();

Explanation: Use function pointer to set the entry address of the function pointed to by the function pointer to 0.

Method 2: Embedded assembly

#pragma asm

LJMP 0FFF0h; //ljmp 0000h

#pragma endasmMethod

3: In the C51 programming process, use a non-existent function to cause a reset.

The following program compiles normally, but resets when it is executed to reset(). The assembly code is

LCALL C:0000.

extern void rest(void); //Does not actually exist.

void main()

{

rest(); //Reset

}

Method 4: If a watchdog is used, use the watchdog reset.

Reference address：51 MCU software program reset

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