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K22_120 :  Is it necessary to stop the OSCERCLK (12MHz) going in VLPS MODE ?

Question asked by koichi sakagami on Jan 29, 2016
Latest reply on Feb 3, 2016 by koichi sakagami

Dear community,


We are developing the custom board with MK22FN1M0AVMC12 device.

 

In the manual (K22P100M120SF5V2RM Rev. 5) Table 7-2. Module operation in low power modes,
it is described that System oscillator specification (at VLPS mode) is
" OSCERCLK max of 4 MHz crystal ".

 

We use a 12MHz oscillator which is connected to EXTAL0 pin.

 

[Question]

        When chip is in VLPS mode,
        is it necessary to stop the OSCERCLK via 12MHz oscillator which is connected to EXTAL0 pin ?

 

        If it is unnecessary to stop the OSCERCLK ,
        we hope to use the LPTMR which is clocking OSCERCLK(12MHz) in order to wake up from VLPS mode.

 

Best Regards,
Koichi Sakagami

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