Is there any stack pointer in PIC ?
I imagine this hardware stack as 8-byte array
and pushing in and pulling out are some like this:

typedef word _14_bit_value;
word stack [8];

push (word return_addres)
{
    int i;
    for (i = 6; i >= 0; i--)
        stack[i+1] = stack[i];        // and last value is overwritten (lost)
    stack[0] = return_address;
}

word pull ()
{
    int i;
    ret_address = stack[0];
    for (i = 0; i < 6; i++)
        stack[i] = stack[i+1];
    return ret_address;
}

Thus, no stack pointer but the stack contents is moving.
On reset is important what the program is thinking about the stack.

Am I correct, what you think ?

Ivan Cenov
okto7@botev.ttm.bg

-----Original Message-----
From: TONY NIXON 54964 <Tony.nixon@ENG.MONASH.EDU.AU>
To: PICLIST@MITVMA.MIT.EDU <PICLIST@MITVMA.MIT.EDU>
Date: ÐÅÔßË, 17 áÐÒÉÌ 1998 Ç. 02:32
Subject: Stack Pointer


Anyone know what happens to the stack pointer on a reset.

On a powerup reset, it is understandable that it would be set to
point to the 1st stack position, but what about a WDT reset or a wake
up from SLEEP.


TIA
Tony


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