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Can I make a 32-bit counter from FTM?

Question asked by Michael Schwager on Nov 7, 2014
Latest reply on Nov 11, 2014 by Michael Schwager

I'm using MK60DN512VLQ10 with MQX 4.1 on a custom PCB.

 

Currently I have FTM0 configured as a free-running counter from FTM_CLKIN1.  I'm driving this with an external 100kHz clock.

However I'd like to have a 32-bit counter, preferably without software intervention, ie interrupts, etc.

 

I thought I could use FTM1 with prescaler = 65536, but the prescaler doesn't go that high.  It only goes to 128.

 

Can I chain two FTMs together to create a 32-bit counter?  The clock source of a given FTM doesn't appear to allow the MSB of a different FTM.

I also have the 100kHz clock going to FTM0_CH4 input, but I'm not using that for anything now.

 

thanks

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