SPC560 - SWT

[ssk]

Posted on August 12, 2015 at 15:03

Hello,

I am using software watchdog timer (SWT) for the SPC560D40 MCU. What is the 'out of reset' situation for the SWT?

Best Regards,

Mike.

#swt

[Erwan YVIN]

Posted on August 17, 2015 at 11:44

Hello Mike ,

it depends of your configuration :

on SWT_CR, there is a bit to set your ''out of reset''

ITR

Interrupt Then Reset.

0 = Generate a reset on a time-out

1 = Generate an interrupt on an initial time-out, reset on a second consecutive time-out

Best regards

                     Erwan

[ssk]

Posted on August 18, 2015 at 10:02

As per reference manual, the reset state for ITR is 0 i.e. generate a reset on timeout but What will be the default value used to decide the timeout (before it is initialized to some value)?

Best Regards,

Mike.

[Erwan YVIN]

Posted on August 19, 2015 at 13:58

Hello Mike ,

The default value is 

Default counter value (SWT_TO_RST) is 1280 (0x00000500 hexadecimal)

which

correspond to around 10 ms with a 128 kHz clock.

    Best Regards

                      Erwan

[ssk]

Posted on August 19, 2015 at 16:38

The default value is considering 128KHz clock but I am using 8MHz external XTAL. In this case what will be the value for timeout at the time of reset?

Mike.

[Erwan YVIN]

Posted on August 24, 2015 at 11:21

Hello Mike ,

The unique SWT counter clock is the undivided slow internal RC oscillator 128 kHz

(SIRC), no other clock source can be selected

   Best Regards

                 Erwan