topic Re: how to reduce power consumption in sleep mode? in LPC Microcontrollers

how to reduce power consumption in sleep mode?

omeredvi — Mon, 23 Jul 2018 17:15:55 GMT

hello,
i'm running an LPC4357 @ 204 MHz, trying to enter sleep mode with ccu1 and ccu2 powered down using the
LPCOpen example:

   // use powerdown bit in ccu
   LPC_CCU1->PM = 1;
   LPC_CCU2->PM = 1;

// set base clk's to IRC

__WFI();

no matter what i do, running with the debugger or without, the board gets stuck before entering sleep mode after the
ccu's powerdown.

any suggestions?

Re: how to reduce power consumption in sleep mode?

jeremyzhou — Tue, 24 Jul 2018 03:17:47 GMT

Hi ,

Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
The core clock is shut down after clear the PD bit in LPC_CCU1->PM register, definitely, it will cause the code to be stuck.
Have a great day,
TIC

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Re: how to reduce power consumption in sleep mode?

omeredvi — Tue, 24 Jul 2018 05:39:33 GMT

Hi,
thanks for the fast response.
i do not quite follow, what clock is shut down? to what do you refer by 'core clock'?
is at all possible to use the PD bit to reduce power consumption with the __WFI() ?
thanks.