IS80C52 Datasheet, PDF (25/48 Pages) Integrated Silicon Solution, Inc – CMOS SINGLE CHIP LOW VOLTAGE 8-BIT MICROCONTROLLER

IS80C52
IS80C32
ISSI ^®
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
IS80C52/32 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 S2 S3 S4 S5 S6 S1 S2 S3 S4 S5 S6 S1
ALE
SEND
WRITE TO SBUF
S6P2
SHIFT
RXD (DOUT)
D0
D1
D2
D3
D4
D5
D6
D7
TXD (SHIFT CLOCK)
TI
S3P1 S6P1
TRANSMIT
WRITE TO SCON (CLEAR RI)
RI
RECEIVE
SHIFT
RXD (DIN)
D0
D1
S5P2
TXD (SHIFT CLOCK)
D2
D3
D4
D5
D6
RECEIVE
D7
Figure 15. Serial Port Mode 0
Integrated Silicon Solution, Inc. — 1-800-379-4774
25
MC004-1D
11/19/98