How to enable COP reset for MC9S12ZVM?

young-kyunpark — Fri, 17 Oct 2014 02:08:42 GMT

How can I enable COP for MC9S12ZVM? or How can I jump to reset vector address when I need It?

Here is my configuration for COPCTL ;

CPMUCLKS_COPOSCSEL0 = 0;

CPMUCLKS_COPOSCSEL1 = 1;

CPMUCLKS_CSAD = 1;

CPMUCOP_WRTMASK = 0;

CPMUCOP_CR = 0x01;

CPMUCOP_WCOP = 0;

CPMUCOP_RSBCK = 1;

but, MCU working without reset.

regarding calling reset vector,

someone reply about jump to reset vector as follow

((void (*__near)(void))0xFFFE)();

but this line occurs syntex error.

Re: How to enable COP reset for MC9S12ZVM?

iggi — Mon, 20 Oct 2014 11:09:03 GMT

Hi Young-kyun,

Watchdog is enabled by a write to the CPMUCOP register i.e. by writing a nonzero value to COP Watchdog Timer Rate Select bits - CR[2:0]. This action enables the COP counter and start the time-out period.
Below is a very simple code performing watchdog reset tested on S12ZVM EVB. The COP source clock is ACLK. The COP time-out period is set to maximum, so the time between two resets is around 13sec. This will be indicated by LED blink.

//******************************************************************************

// Main program

//******************************************************************************

void main(void) {

unsigned int i;

CPMUCLKS_COPOSCSEL1 = 1; // COP clock source is ACLK

DDRS = 0xff; // Port S set as output

PTS = 0x00; // LEDs off

for(i=0; i<60000; i++) // delay

{

asm nop;

}

PTS = 0xff; // LEDs on

CPMUCOP = 0x47; // Enable watchodg

for(;;) {} /* wait forever */

}

Regarding the jump to reset vector, actually the address is 0xFFFC. You can also use "asm jmp _Startup;"

Regards,

iggi

topic Re: How to enable COP reset for MC9S12ZVM? in S12 / MagniV Microcontrollers

How to enable COP reset for MC9S12ZVM?

Re: How to enable COP reset for MC9S12ZVM?