How do I implement a software reset in my source program?
We know that 51 MCU can put data in the program memory, that is, there is no essential difference between the program and the data, and it is some specific data. If we store a program in the form of array data in the program memory, can it be executed? The answer is yes.
answer:
You can use the following program to jump to 0000H to implement a soft reset. The following program is actually a function pointer pointing to the 0000H address.
((void (code *) (void)) 0x0000) ();
The following example will implement software self-reset void reset (void)
{
((void (code *) (void)) 0x0000) ();
}
Void main (void)
{
Reset ();
}
You may notice that the above soft reset program does not clear the 8051 interrupt system and some 8051 peripherals. When you call the above software reset program in the interrupt program, the interrupt will not be triggered. Therefore, the above soft reset program cannot be called in the interrupt subroutine.
The following small assembly function can be called in the interrupt program or the main program. This function pushes 0x0000 onto the stack and then pops it out via "RETI". This will clear the interrupt environment and let the program restart from 0000H.
The above program works well when selecting the bank 0 register set. If the bank0 register set is not selected, the expected result may not be obtained. You should select "MOV PSW, #0" in the above program or startup code to select the bank 0 register set.
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