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WDT Reconfigure

Question asked by Robin S on Jun 26, 2014
Latest reply on Jul 2, 2014 by Ankur Kala

Hi All,


I am Trying to reconfigure WDT but it's not working properly for µC MC9S08RN8  please can someone see my code?


void main {

WDOG_CNT = 0xC520;                                    // write the 1st unlock word

WDOG_CNT = 0xD928;                                    // write the 2nd unlock word

WDOG_TOVAL = 4;                                         // setting timeout value

WDOG_CS2 = 0X12;                                        //Prescaler is selected for 256 and 32Khz clock





PORT_PTAD =  0x00;

while(1) {

PORT_PTAD =  0x0F;





According to new configuration i should get 31.25msec WDT RESET but the reset i am getting is  7 msec which is Default value of   WDT RESET.


I also tried  using WDOG_CS1_UPDATE register but after updating that register i am not getting any reset.


I am using Codewarrior 10.5 and PE Micro USBMultilink interface for programming.



Thanks and Kind Regards