Can I route a pin to PINT and USART at the same time?

[wangyanjun]

My application need to capture the USART's RxD falling edge. Can I route the pin (P0_29) to PINT and USART at the same time?

Thank you!

[wangyanjun]

LPC54616J512BD100

[ZhangJennie]

No, you can't config the pin as PINT and USART at the same time.

[wangyanjun]

I just test it.

I config P0_29 as USART RxD and PINT int0 input at the same time. When there is signal on the RxD pin, it can generate PINT interrupt and USART receive interrupt.

[ZhangJennie]

you may get it work during debug. But we can't guarantee both of PINT and UART still work well in run mode or increase the communication speed. This usage is not suggested. 

[wangyanjun]

In run mode, it will not work?

I use PINT to capture UART start bit's falling edge only and the baudrate is 19200. Is this OK?

Thank you!

[ZhangJennie]

 Because we don't suggest user use one pin as PINT and UART at the same time. You are not using part with our suggested way, so by checking, we can't guarantee it.

Don't have have another pin to get PINT interrupt? 

[wangyanjun]

For new design, I can use another pin as PINT. For existing product, I want to add new function by firmware update only.

[ZhangJennie]

As I said this is not our recommended way of using part.

We can't guarantee the function work all well if you insist working this way. 

[ZhangJennie]

Please let me know your chip full part number. I will check.

Thanks,

Jun Zhang