W79E225A_08 Datasheet, PDF (146/203 Pages) Winbond – 8-bit Microcontroller

Preliminary W79E225A/226A/227A Data Sheet
Fosc/2
1/2
SMOD 0 1
1/16
1/16
SAMPLE
1-To-0
DETECTOR
RXD
Write to
SBUF
TX START
TX CLOCK
Transmit Shift Register
1
TB8
Internal
Data Bus
0
STOP
D8
PARIN
START ^SOUT
LOAD
CLOCK
TXD
TX SHIFT
Serial
Controllor ^TI
RX CLOCK
RI
Serial Interrupt
TX START
LOAD SBUF
RX SHIFT
Read SBUF
BIT
DETECTOR
CLOCK PAROUT
SBUF
SIN
D8
RB8
Receive Shift Register
Internal
Data Bus
Figure 16-3 Serial Port Mode 2
16.4 Mode 3
This mode is the same as Mode 2, except that the baud rate is programmable. The program must
select the mode and baud rate in SCON before any communication can take place. Timer 1 should be
initialized if Mode 1 or Mode 3 will be used.
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Publication Release Date: April 15, 2008
Revision A4.0