C8051F124-GQR Datasheet, PDF (292/350 Pages) Silicon Laboratories – Mixed Signal ISP Flash MCU Family

C8051F120/1/2/3/4/5/6/7
C8051F130/1/2/3
RS-232
RS-232
LEVEL
XLTR
TX
RX ^C8051Fxxx
OR
TX
MCU
RX
TX
C8051Fxxx
RX
Figure 21.6. UART0 Modes 1, 2, and 3 Interconnect Diagram
21.1.4. Mode 3: 9-Bit UART, Variable Baud Rate
Mode 3 uses the Mode 2 transmission protocol with the Mode 1 baud rate generation. Mode 3 operation
transmits 11 bits: a start bit, 8 data bits (LSB first), a programmable ninth data bit, and a stop bit. The baud
rate is derived from Timer 1 or Timer 2, 3, or 4 overflows, as defined by Equation 21.1 and Equation 21.3.
Multiprocessor communications and hardware address recognition are supported, as described in Section
21.2.
292
Rev. 1.4