HSER baudrate

[mister_e]

When changing baudrate on the fly, you want to turn off the USART before though.

RCSTA=0
SPBRG=xyz
TXSTA = whatever, assuming it's value change from baudrate to baudrate
RCSTA=$90

[pedja089]

Thanks, guys.
Both examples helped me. Just to see which registers should be set. Today I'll try ..

[mister_e]

Get the latest version of my PICMultiCalc on this forum, it will give you a good kick.

[pedja089]

Everything works great. The calculator has really helped me.
Here's the code if someone needs it.

             IF HSerBaud=0 THEN
                RCSTA = 0
                SPBRG = 207 ' 300 Baud @ 4MHz, 0.0% 
                RCSTA = $90 ' Enable serial port & continuous receive
                TXSTA = $20 ' Enable transmit, BRGH = 0
             endif   
             IF HSerBaud=1 THEN
                RCSTA = 0
                SPBRG = 25  ' 2400 Baud @ 4MHz, 0.17%
                RCSTA = $90 ' Enable serial port & continuous receive
                TXSTA = $20 ' Enable transmit, BRGH = 0
             endif
             IF HSerBaud=$BD THEN
                RCSTA = 0
                SPBRG = 25  ' 9600 Baud @ 4MHz, 0.16%
                RCSTA = $90 ' Enable serial port & continuous receive
                TXSTA = $24 ' Enable transmit, BRGH = 1
             endif

[mister_e]

For safety sake, I would set RCSTA at the end, just after TXSTA.

[pedja089]

Done. But I don't see what difference it makes.
Can someone explain?

[mister_e]

It shouldn't make so much difference, but it's a bit more logical to me

1. You disable the USART
2. You set the baudrate and mode
3. You Enable the USART

Open the datasheet, and see what else you do when you write 0 or $90 to RCSTA, it does more than just enable/disable the USART.