IS80C52 Datasheet, PDF (26/48 Pages) Integrated Silicon Solution, Inc – CMOS SINGLE CHIP LOW VOLTAGE 8-BIT MICROCONTROLLER

IS80C52
IS80C32
ISSI ^®
TIMER 1
OVERFLOW
TIMER 2
OVERFLOW
÷2
SMOD
=0
SMOD
=1
WRITE
TO
SBUF
"0"
"1"
TCLK
÷ 16
"0"
"1"
RCLK
SAMPLE
1-TO-0
TRANSITION
DETECTOR
RXD
IS80C52/32 INTERNAL BUS
TB8
DSQ
CL
SBUF
ZERO DETECTOR
START
SHIFT _DATA
TX CONTROL
RX CLOCK _TI
SEND
SERIAL
PORT
÷ 16
INTERRUPT
RX CLOCK RI
START RX CONTROL
LOAD
SBUF
SHIFT
1FFH
BIT
DETECTOR
INPUT SHIFT REG.
(9 BITS)
LOAD
SBUF
SHIFT
TXD
READ
SBUF
SBUF
IS80C52/32 INTERNAL BUS
TX CLOCK
WRITE TO SBUF
SEND
DATA
SHIFT
TXD
S1P1
START
BIT
D0
D1
D2
D3
D4
D5
D6
D7
STOP BIT
TI
RX
CLOCK
÷ 16 RESET
RXD
START
BIT
D0
D1
D2
D3
D4
D5
D6
D7
STOP BIT
RECEIVE ^{BIT DETECTOR SAMPLE TIMES}
SHIFT
RI
TRANSMIT
Figure 16. Serial Port Mode 1
26
Integrated Silicon Solution, Inc. — 1-800-379-4774
MC004-1D
11/19/98