Kawasaki 80C152, 80C51, KS152JB Local Serial Port Mode 2

KS152JB Universal Communications Controller
Technical Specifications
Kawasaki LSI USA, Inc. Page 27 of 120 Ver. 0.9 KS152JB2
MODE 3
This mode is similar to Mode 2 in all respects, except that the baud rate is programmable.
In all four modes, transmission is started by any instruction that uses SBUF as a destination regis-
ter. Reception is initiated in Mode 0 by the condition RI = 0 and REN = 1. Reception is initiated in
the other modes by the incoming start bit if REN = 1.
SOUT
STOP
D8
PARIN
START
LOAD
CLOCK
TX START
TX CLOCK
Transmit Shift Register
16
SIN
D8
PAROUT
CLOCK
BIT
DETECTOR
RX CLOCK
RX SHIFT
1-TO-0
DETECTOR
16
RX
SBUF
RB8
LOAD
SBUF
START
Read
SBUF
TX SHIFT
TI
RI
SERIAL
CONTROLLER
2
SMOD
01 Write to
SBUF
Internal
Data Bus
0
TB8
1
Internal
Data Bus
RxD
TxD
Serial Interrupt
Clock / 2
Receive Shift Register
Local Serial Port Mode 2