C8051F02X Datasheet, PDF (219/272 Pages) Silicon Laboratories – 8K ISP FLASH MCU Family

C8051F020/1/2/3
Figure 21.6. UART Modes 1, 2, and 3 Interconnect Diagram
RS-232
RS-232
LEVEL
XLTR
TX
RX ^C8051Fxxx
OR
TX
MCU
RX
TX
C8051Fxxx
RX
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 4 overflows, as defined by Equation 21.1 and Equation 21.2. Multiprocessor communications and
hardware address recognition are supported, as described in Section 21.2.
Rev. 1.4
219