What clock frequency for a certain baud rate?

[atferrari]

PIC 18F family EUSART

Many years ago I was able to grasp this but I forgot all about it.

For a certain baud rate, how could I know the EUSART's frequency of the clock when transmitting in Synchronized mode?

I understand that I should define if it is 8 or 9 bits/symbol, right? And add if there is parity bit?

Something like Tx clok freq = Baud rate * (8+1)??

If I look at lost on this, yes, I am.

Please, I know the formulas in the datasheet. What I am asking is the relationship between baud rate and Tx clock frequency because I intend use it in non standard way.

Gracias.

 

[Sceadwian]

I'm not sure of your specific case but to the best of my knowledge for proper synchronous serial communication, the usarts clock rate needs to be 4 times the synchronized baud rate minimum. Please read carefully as I stated that the usarts clock rate, the usart is fed from the clock frequency by an addition prescaler unit.

You'd have to define non-standard and exactly what you're doing to clarify things further.

 

[atferrari]

Discarded the idea

Gracias for replying Sceadwian.

I was exploring the possibility to use the EUSART Tx clock of a 18F PIC micro to control a switched capacitor filter.

I discarded the idea because to have it running continuously I should keep the micro busy in feeding byte after byte to the EUSART to transmit permanently.

 

[Sceadwian]

You could always use two chips =)