IC80C51 Datasheet, PDF (23/44 Pages) Integrated Circuit Solution Inc – CMOS SINGLE CHIP 8-BIT MICROCONTROLLER

IC80C51
IC80C31
TIMER 1
OVERFLOW
2
SMOD
=0
SMOD
=1
WRITE
TO
SBUF
16
SAMPLE
1-TO-0
TRANSITION
DETECTOR
RXD
IC80C51/31 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
IC80C51/31 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
Figure 12. Serial Port Mode 1
Integrated Circuit Solution Inc.
MC001-0B
TRANSMIT
23