IC80C51 Datasheet, PDF (22/44 Pages) Integrated Circuit Solution Inc – CMOS SINGLE CHIP 8-BIT MICROCONTROLLER

IC80C51
IC80C31
IC80C51/31 INTERNAL BUS
WRITE
TO
SBUF
DSQ
CL
SBUF
ZERO DETECTOR
SHIFT
RXD
P3.0 ALT
OUTPUT
FUNCTION
S6
REN
RI
START
TX CONTROL
TX CLOCK
SHIFT
SEND
SERIAL
PORT
INTERRUPT
RX CLOCK ^RI
RECEIVE
START
RX CONTROL
SHIFT
11111110
INPUT SHIFT REG.
LOAD
SBUF
SHIFT
SHIFT
CLOCK
TXD
P3.1 ALT
OUTPUT
FUNCTION
RXD
P3.0 ALT
INPUT
FUNCTION
READ
SBUF
SBUF
IC80C51/31 INTERNAL BUS
S4 S5 S6 S1 S2 S3 S4 S5 S6 S1 S2 S3 S4 S5 S6 S1 S2 S3 S4 S5 S6 S1 S2 S3 S4 S5 S6 S1 S2 S3 S4 S5 S6 S1 S2 S3 S4 S5 S6 S1 S2 S3 S4 S5 S6 S1 S2 S3 S4 S5 S6 S1 S2 S3 S4 S5 S6 S1 S2 S3 S4 S5 S6 S1
ALE
SEND
SHIFT
WRITE TO SBUF
S6P2
RXD (DOUT)
D0
D1
D2
D3
D4
D5
D6
D7
TRANSMIT
TXD (SHIFT CLOCK)
S3P1
TI
S6P1
WRITE TO SCON (CLEAR RI)
RI
RECEIVE
SHIFT
RXD (DIN)
D0
D1
D2
D3
S5P2
TXD (SHIFT CLOCK)
D4
D5
D6
D7
RECEIVE
S3-22
Figure 11. Serial Port Mode 0
Integrated Circuit Solution Inc.
MC001-0B