
EZ-USB FX2 Technical Reference Manual
Page 14-26 EZ-USB FX2 Technical Reference Manual v2.1
Figure 14-14. Serial Port 0 Mode 2 Receive Timing
14.3.7 Mode 3
Mode 3 provides asynchronous, full-duplex communication, using a total of 11 bits: 1 start bit, 8
data bits, a programmable 9th bit, and 1 stop bit. The data bits are transmitted and received LSB
first.
The mode 3 transmit and operations are identical to mode 2. The mode 3 baud rate generation is
identical to mode 1. That is, mode 3 is a combination of mode 2 protocol and mode 1 baud rate.
Figure 14-15 illustrates the mode 3 transmit timing. Figure 14-16 illustrates the mode 3 receive
timing.
Mode 3 operation is identical to that of the standard 8051 when Timer 1 uses CLKOUT/12,
(T1M=0, the default).
RI_0
TXD0
RXD0
RXD0OUT
SHIFT
RX CLK
TI_0
D0 D1 D2 D3 D4 D5 D6 D7
STOP
START
RB8
Bit detector
sampling
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