ST ST10F276E - Asynchronous Operation

DocID13284 Rev 2 261/564
UM0404 XBUS asynchronous / synchronous serial interface
Note: Serial data transmission or reception is only possible when the Baud rate Generator Run bit
S1R is set to ‘1’. Otherwise the serial interface is idle.
Do not program the mode control field S1M in register XS1CON to one of the reserved
combinations to avoid unpredictable behavior of the serial interface.
XS1TBUF (E908h) XBUS Reset Value: 0000h
XS1RBUF (E90Ah) XBUS Reset Value: 00xxh
11.1 Asynchronous operation
Asynchronous mode supports full-duplex communication, where both transmitter and
receiver use the same data frame format and the same Baud rate. Data is transmitted on pin
TXD1/P8.7 and received on pin RXD1/P8.6. These signals are alternate functions of Port8
pins.
1514131211109876543210
------- Transmit Data Buffer
RW
1514131211109876543210
------- Received Data
RW