KE04 glitch filter

[jun1]

Thank you for your help.

If the KE04 pin is set to GPIO output (GPIOx_PDDR = 1) and input disabled (GPIOx_PIDR = 1), is the glitch filter valid? 
This is because when I look at the input value (PIOx_PDIR) to check the output level of the output port, I think it would be better to have a glitch filter.

Thank you.

jun

[Robin_Shen · Accepted solution]

Hi jun,

According to the "Figure 11-1. Normal I/O structure", the input glitch filter will not impact the output value.

When you want to read the GPIO output value, you may need to configured this pin for General Purpose Input(GPIOx_PIDR = 0). Otherwise corresponding Port Data Input Register bit will read zero.

I'm not sure if really need to enable input glitch filter just to read the output value. This function is usually used to read the signal with external interference instead of the output value of this pin itself.

Best Regards,

Robin

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[jun1]

Thank you for your reply.

understood. If the output port is set as it is, the glitch filter can be enabled and the output value can be input. Certainly a glitch filter may not be necessary to see the output value.

Thank you for your teachings.

jun