Microcontroller User's Guide

USER’S GUIDE
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MODE2 AND 3 BLOCK DIAGRAM Figure 14–4
T1
FLAG
BIT
DETECTOR
RXD
PIN
DIV.
BY
16
XMIT SHIFT REGISTER
SI S0
LOAD CLK
DATA BUS
P3.1
LATCH
TXD
PIN
WRSBUF
RDSBUF
DIVIDE
BY 16
R1
FLAG
SERIAL
INTERRUPT
WRSBUF
SCLK
RESET
SI0 CONTROL
SHIFT
RDSBUF
LOAD
RD RCV DATA BUFFER WR
SI S0
RECEIVE SHIFT REGISTER
CLK Q7 Q6 Q5 Q4 Q3 Q2 Q1 Q0
TB8
Q8
RB8
BRG
CLOCK
D0 D1 D2 D3 D4 D5 D6 D7 STOP
D0 D1 D2 D3 D4 D5 D6 D7 STOP
D8
TRANSMIT TIMING:
WRSBUF
SHIFT
TXD
TI
RXD
BIT DETECTOR
SAMPLING
SHIFT
RI
RECEIVE TIMING:
D8 D6 D5 D4 D3 D2 D1 D0 STOP START D7
10