Question UART MSP430F5529

0: jump to step2 the first time
1: wait for TX IFG to be set
2: write to TXBUF, should clear TX IFG flag immediately
3: go to 1

So it's something wrong with you USCI setup, or just to high of a baudrate for your RX receiver to keep up.

Next step: use TX_IRQ to advance to next char to TX.

1. Thanks a lot for your answer. I think the problem until now was that I am trying to use SMCLK but I do not know where exactly I can find at which default frequency it is configured. So I was using the configuration with oversampling respective to a clock of 1000000 Hz. However, now I changed it to that of 1,048,576 Hz and it worked perfectly. I have been trying to find out where I can see the default frequencies for SMCLK and MCLK in the device specific (MSP430F5529) datasheet, but I did not find it.

2. What do you mean by TX_IRQ?

> What do you mean by TX_IRQ?

The preferred way is to have TX IFG IRQ handle of transfer of the next char to TX_BUF.
So no hard-wait using While() as the mcu runs at full speed checking the bit over and over.

A TX IRQ is just run once when IFG is ready, a check (wait) that is all done in hardware.

Ernesto:

The maximum UART frequency is 1 MHz. (f_BITCLK)

Is there a way for you to operate a slightly less than 1 MHz?

Ernesto:

My earlier post regarding UART frequency:

http://e2e.ti.com/support/microcontrollers/msp430/f/166/t/183143.aspx

Wow Todd, thanks for the info. 

Tony, the 1MHz limit refers to the baudrate (bit clock), not the USCI clock before baudrate divider. The USCI clock input can go as high as maximum system clock.