Mitsubishi DS907x SIP User Manual page 118

USER'S GUIDE
SERIAL PORT MODE 1 BLOCK DIAGRAM Figure 14–3
TIMER 1
OVERFLOW
WRSBUF
f /2
CLK
RDSBUF
1 0
SMOD
MUX
DIVIDE
BY 16
T1
FLAG
FLAG
TRANSMIT TIMING:
WRSBUF
SHIFT
TXD
TI
RECEIVE TIMING:
RXD
BIT DETECTOR
SAMPLING
SHIFT
RI
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SI
LOAD CLK
WRSBUF
SCLK
RDSBUF
RESET
SI0 CONTROL
R1
SERIAL
INTERRUPT
DIV.
BY
16
D0 D1
D0 D1
XMIT SHIFT REGISTER
1
SHIFT
LOAD
SI
BIT
DETECTOR
D2 D3 D4
D2 D3 D4
118
P3.1
S0
LATCH
0
DATA BUS
RD RCV DATA BUFFER
CLK Q7 Q6 Q5 Q4 Q3 Q2
RECEIVE SHIFT REGISTER
D5 D6 D7
D5 D6 D7
TXD
PIN
WR
Q1 Q0
S0
RXD
PIN
STOP
STOP