FRDM-KL03Z - VREF and UART0_RX (Bootloader)

[aes_mike]

This is a two part question:

1. How or where in the documentation does the internal VREF get routed over to the ADC or is this intended to drive a sensor only?

I was hoping to use the VREF as a voltage reference to the ADC, but not clear to me that it is possible.

2. If VREF can be used by the ADC, then how does one deal with UART0_RX at PTB2?  Can it be re-routed somehow?  But from what I understand the bootloader will try to use UART0 with TX/RX at PTB1 and PTB2, respectively.

Can someone explain this?

[jeremyzhou]

Hi Mike,

1. How or where in the documentation does the internal VREF get routed over to the ADC or is this intended to drive a sensor only?

I'd like to suggest that you can find detailed information of the VREF_OUT implement in the Chapter 30: Voltage Reference (VREF) in the KL03's reference manual.

And you can download it through it link as below.

http://cache.freescale.com/files/32bit/doc/ref_manual/KL03P24M48SF0RM.pdf?fasp=1&WT_TYPE=Reference%2...

2. If VREF can be used by the ADC, then how does one deal with UART0_RX at PTB2?  Can it be re-routed somehow?  But from what I understand the bootloader will try to use UART0 with TX/RX at PTB1 and PTB2, respectively.

It's not available to use the VREF_OUT and UART0_RX at the same time, you can only choose one specific function of the pin.

Hope it helps.
Have a great day,
Ping

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