51 MCU software reset assembly code
POP ACC ; pop return address
POP ACC
; Eject 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 Using C51
Method 1:
void(*SoftReset)();
SoftReset=0;
SoftReset();
Explanation: Use a 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 endasm
Method 3: During C51 programming, use a non-existent function to cause a reset.
The following program compiles fine, but resets when it reaches 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 a watchdog reset.
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