AM623: UART Clocking

Antenna_Head

Part Number: AM623
Other Parts Discussed in Thread: SYSCONFIG

Asking on behalf of a customer:

We are using TI AM6232ASGGHAALW and we would like to get some advices on how to configure the UART Clock to 3.125Mhz. The default clock source frequency to UART0/1/6 are 48Mhz and the divider needs to be in integer, hence by using default clock frequency (48Mhz), we can’t get exactly 3.125Mhz due to the chip only support integer divider. 48Mhz/15=3.2Mhz or 48Mhz/16=3Mhz. From the TI sysconfig, we seems able to change the clock source for the UART to 12.5Mhz instead of 48Mhz, I know it will impact other peripherals, but we would like to know if it’s feasible to change the frequency like below for our processor to get 3.125Mhz for UART?

over 1 year ago

0 Kallikuppa Sreenivasa over 1 year ago

TI__Guru**** 196389 points

Hello Antenna_Head

Thank you for the query.

below are the baudrates that could be set with 48M

Help me understand your query.

Are you checking if this is has been tested or if it if feasible to configure the 12.5 M?

Regards,

Sreenivasa

0 Antenna_Head over 1 year ago in reply to Kallikuppa Sreenivasa

TI__Genius 12900 points

Thanks; will see if this is sufficient- I'm not sure what their concern is just yet given the baud rate generator capabilities shown.

0 Antenna_Head over 1 year ago in reply to Antenna_Head

TI__Genius 12900 points

This is the feedback I received:

We would like to have exactly 3.125Mhz for UART. With 48Mhz, we can’t get exact 3.125Mhz, can we change this 48Mhz to other value in order to get 3.125Mhz?

I don't understand why it must be so precise- seems there is something important about the timing. Is their only option to go to 12.5 MHz and then divide by 4, per the original post?