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MSM80C154S/83C154S/85C154HVS
100
SCON
SMOD TCLK RCLK SERR
TX CONTROL
RX CONTROL
(PCON.7) (T2CON.4) (T2CON.5) (IOCON.5)
SBUF (R)
INPUT SHIFT
REGISTER
SBUF (T)
MULTIPLEXER
RXD (P3.0)
MULTIPLEXER
TXD (P3.1)
SHIFT CLOCK
INTERNAL BUS
TIMER/COUNTER1
OVERFLOW
TIMER/COUNTER2
OVERFLOW
1/2OSC.
Note:
: Internal bus connection
: Serial data flow and
shift clock
: Control coupling
Figure 4-27 Serial port