5/9

STR71x UART COMMUNICATION WITH A PC USING RS232

2.4 UART CONFIGURATION

The peripheral is configured using the UART Control Register (CR), and the Baud Rate Reg-

ister (BRR).

As in this application a polling strategy is used, UART interrupts are disabled. Also FIFOs and

loop back mode are disabled.

In the application, data length can be 8 bits or 9 bits (parity bit included). Parity must be odd or

even parity if you select 7 bit mode or 8 bit mode with parity is selected. Select No Parity if 8

bit mode is selected, stop bits can be 1, 1.5 or 2 stop bits.

2.4.1 Baud rate selection

Then you must select the baud rates. We should always have the same baud rates in the PC

and in the UART.

The baud rates are calculated as follows: