IC80C51 Datasheet, PDF (24/44 Pages) Integrated Circuit Solution Inc – CMOS SINGLE CHIP 8-BIT MICROCONTROLLER

IC80C51
IC80C31
WRITE
TO
SBUF
PHASE 2 CLOCK
(1/2 fOSC)
MODE 2
16
SMOD 1
2
SMOD 0
(SMOD IS PCON. 7)
SAMPLE
1-TO-0
TRANSITION
DETECTOR
RXD
IC80C51/31 INTERNAL BUS
TB8
DSQ
CL
SBUF
ZERO DETECTOR
START ^{STOP BIT GEN SHIFT} DATA
TX CONTROL
TX CLOCK
TI
SEND
SERIAL
PORT
INTERRUPT
16
RX RI
START ^CLOCK
RX CONTROL
LOAD
SBUF
SHIFT
1FFH
BIT
DETECTOR
INPUT SHIFT REG.
(9 BITS)
LOAD
SBUF
SHIFT
TXD
READ
SBUF
SBUF
TX
CLOCK
IC80C51/31 INTERNAL BUS
WRITE TO SBUF
DATA
SHIFT
TXD
TI
SEND
S1P1
START
BIT
D0
D1
D2
D3
D4
D5
D6
D7
TB8
STOP BIT
STOP BIT GEN
TRANSMIT
RX
CLOCK
16 RESET
RXD
START
BIT D0
D1
D2
D3
D4
D5
D6
D7
RB8 STOP
BIT
RECEIVE ^{BIT DETECTOR SAMPLE TIMES}
SHIFT
RI
Figure 13. Serial Port Mode 2
S3-24
Integrated Circuit Solution Inc.
MC001-0B