topic Re: Low power mode and watchdog operation in Kinetis Microcontrollers https://community.nxp.com/t5/Kinetis-Microcontrollers/Low-power-mode-and-watchdog-operation/m-p/673944#M41415 <HTML><HEAD></HEAD><BODY><P>Hi Jing</P><P></P><P>I am servicing the watchdog alot during operation and am doing it just before it goes to sleep (writing 0x55 and 0xAA in the SRVCOP register).</P><P>Are you saying that the COP continues to count while in sleep mode? this would explain things. how would I stop it while in sleep mode? obviously i dont want the processor to reset if it goes to sleep</P><P></P><P>Regards</P></BODY></HTML> Wed, 19 Jul 2017 09:21:38 GMT scottyevans 2017-07-19T09:21:38Z Low power mode and watchdog operation https://community.nxp.com/t5/Kinetis-Microcontrollers/Low-power-mode-and-watchdog-operation/m-p/673942#M41413 <HTML><HEAD></HEAD><BODY><P>Hello,</P><P></P><P><SPAN>I'm</SPAN> workng with a KL02 device and have it going to sleep every 30 seconds when a particular input is not high. <SPAN>I'm</SPAN> finding that this works when the watchdog is disabled but not when it is enabled.</P><P></P><P>does the watchdog fire if the device goes into sleep? <SPAN>I'm</SPAN> guessing that if the watchdog counter isnt reset (as I'm doing continuously in the program) the watchdog will reset.</P></BODY></HTML> Tue, 18 Jul 2017 10:28:51 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/Low-power-mode-and-watchdog-operation/m-p/673942#M41413 scottyevans 2017-07-18T10:28:51Z Re: Low power mode and watchdog operation https://community.nxp.com/t5/Kinetis-Microcontrollers/Low-power-mode-and-watchdog-operation/m-p/673943#M41414 <HTML><HEAD></HEAD><BODY><P>hi Scott,</P><P>The COP watchdog will not generate a interrupt to wakeup the MCU. Since in sleep mode &nbsp;COP continue to work, I guess the MCU maybe reseted by watchdog.&nbsp; You'd better feed dog periodically before watchdog reset.</P><P></P><P>Regards</P></BODY></HTML> Wed, 19 Jul 2017 08:59:32 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/Low-power-mode-and-watchdog-operation/m-p/673943#M41414 jingpan 2017-07-19T08:59:32Z Re: Low power mode and watchdog operation https://community.nxp.com/t5/Kinetis-Microcontrollers/Low-power-mode-and-watchdog-operation/m-p/673944#M41415 <HTML><HEAD></HEAD><BODY><P>Hi Jing</P><P></P><P>I am servicing the watchdog alot during operation and am doing it just before it goes to sleep (writing 0x55 and 0xAA in the SRVCOP register).</P><P>Are you saying that the COP continues to count while in sleep mode? this would explain things. how would I stop it while in sleep mode? obviously i dont want the processor to reset if it goes to sleep</P><P></P><P>Regards</P></BODY></HTML> Wed, 19 Jul 2017 09:21:38 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/Low-power-mode-and-watchdog-operation/m-p/673944#M41415 scottyevans 2017-07-19T09:21:38Z Re: Low power mode and watchdog operation https://community.nxp.com/t5/Kinetis-Microcontrollers/Low-power-mode-and-watchdog-operation/m-p/673945#M41416 <HTML><HEAD></HEAD><BODY><P>Hi</P><P><span class="lia-inline-image-display-wrapper" image-alt="pastedImage_1.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/25985iF82B9A3AE4ED61E0/image-size/large?v=v2&amp;px=999" role="button" title="pastedImage_1.png" alt="pastedImage_1.png" /></span></P><P></P><P>When you write SLEEP mode which low leakage mode is involved (WAIT, STOP, VLPS, VLLSx)?</P><P></P><P>Regards</P><P></P><P>Mark</P></BODY></HTML> Wed, 19 Jul 2017 10:15:34 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/Low-power-mode-and-watchdog-operation/m-p/673945#M41416 mjbcswitzerland 2017-07-19T10:15:34Z Re: Low power mode and watchdog operation https://community.nxp.com/t5/Kinetis-Microcontrollers/Low-power-mode-and-watchdog-operation/m-p/673946#M41417 <HTML><HEAD></HEAD><BODY><P>Hi Mark</P><P></P><P>Im going into VLPS. The datasheet suggests that it should be static in this mode. So i was expecting it to cease, and then continue from where it was.</P><P></P><P>Im using the internal clock, so Id expect it to reset upon entry, but not to count as its in VLPS</P><P></P><P>Regards</P></BODY></HTML> Wed, 19 Jul 2017 10:21:23 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/Low-power-mode-and-watchdog-operation/m-p/673946#M41417 scottyevans 2017-07-19T10:21:23Z Re: Low power mode and watchdog operation https://community.nxp.com/t5/Kinetis-Microcontrollers/Low-power-mode-and-watchdog-operation/m-p/673947#M41418 <HTML><HEAD></HEAD><BODY><P>Scott</P><P></P><P>I have used VLPS on many KL parts with enabled COP and never experienced a reset (using LPO set to 1.024s). Therefore I don't expect the behavior that you are seeing....</P><P></P><P>Regards</P><P></P><P>Mark</P></BODY></HTML> Wed, 19 Jul 2017 10:32:06 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/Low-power-mode-and-watchdog-operation/m-p/673947#M41418 mjbcswitzerland 2017-07-19T10:32:06Z