Mode 3: 9-Bit Uart, Variable Baud Rate; Figure 21.6. Uart0 Modes 1, 2, And 3 Interconnect Diagram - Silicon Laboratories C8051F12 Series Manual

C8051F120/1/2/3/4/5/6/7 C8051F130/1/2/3

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
21.2 .
292
TX
RS-232
RS-232
LEVEL
RX
XLTR
OR
TX TX
MCU
RX RX
Rev. 1.4
C8051Fxxx
C8051Fxxx
Section