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Philips Semiconductors Product data sheet
SC28L91
3.3 V or 5.0 V Universal Asynchronous
Receiver/Transmitter (UART)
2004 Oct 21
6
8
D0–D7
RDN
WRN
CEN
A0–A3
RESET
INTRN
X1/CLK
X2
4
BUS BUFFER
OPERATION CONTROL
ADDRESS
DECODE
R/W CONTROL
INTERRUPT CONTROL
IMR
ISR
TIMING
BAUD RATE
GENERATOR
CLOCK
SELECTORS
COUNTER/
TIMER
XTAL OSC
CSR
ACR
CTL
DATA CHANNEL
16 BYTE TRANSMIT
FIFO
TRANSMIT
SHIFT REGISTER
16 BYTE RECEIVE
FIFO
MRA0, 1, 2
CRA
SRA
INPUT PORT
CHANGE OF
STATE
DETECTORS (4)
OUTPUT PORT
FUNCTION
SELECT LOGIC
OPCR
TxDA
RxDA
IP0-IP6
OP0-OP7
V
CC
V
SS
CONTROL
TIMING
INTERNAL DATABUS
IPCR
ACR
OPR
CTU
8
7
WATCH DOG TIMER
RECEIVE SHIFT
REGISTER
SD00702
GP
Figure 1. Block Diagram (80XXX mode)