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k20 reset pin filter

Question asked by Lei Mao on Dec 27, 2016
Latest reply on Jan 3, 2017 by xiangjun.rong

I used MK20DX256ZVMC10. Want use reset pin filter function. But no works.

If we make reset pin low level < 5mS, the k20 will not reset. But k20 reset.

Where are the problem?


k20 datasheet:

The RESET pin supports digital filtering in all modes of operation. For LLS and VLLSx
modes, the LLWU provides an optional fixed digital filter running off the 1 kHz LPO


The LPO filter is simple with a fixed filter value count of 3. There is also a synchronizer
on the input signal that results in an associated latency (2 cycles). As such, it takes 5
cycles to complete a transition from low-to-high or high-to-low. The LPO Filter
initializes to off (logic 1) when the LPO filter is not enabled.


code :

SIM_SOPT6 |= (0x02 << 29);