scn2681t NXP Semiconductors, scn2681t Datasheet - Page 3
scn2681t
Manufacturer Part Number
scn2681t
Description
Dual Asynchronous Receiver/transmitter Duart
Manufacturer
NXP Semiconductors
Datasheet
1.SCN2681T.pdf
(15 pages)
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Philips Semiconductors
BLOCK DIAGRAM
2004 Mar 22
Dual asynchronous receiver/transmitter (DUART)
X1/CLK
RESET
INTRN
D0–D7
A0–A3
WRN
CEN
RDN
X2
4
8
OPERATION CONTROL
INTERRUPT CONTROL
R/W CONTROL
BUS BUFFER
GENERATOR
SELECTORS
BAUD RATE
COUNTER/
XTAL OSC
ADDRESS
DECODE
CLOCK
TIMING
TIMER
CSRB
CTLR
CTLR
CSRA
IMR
ACR
ISR
U
Figure 1. Block Diagram
3
SHIFT REGISTER
HOLDING REG (3)
SHIFT REGISTER
SELECT LOGIC
DETECTORS (4)
HOLDING REG
OUTPUT PORT
CHANNEL A
CHANNEL B
(AS ABOVE)
INPUT PORT
CHANGE OF
FUNCTION
TRANSMIT
TRANSMIT
RECEIVE
RECEIVE
MRA1, 2
STATE
OPCR
OPR
CRA
SRA
IPCR
ACR
7
8
SCN2681T
SD00099
TxDA
RxDA
TxDB
RxDB
IP0-IP6
OP0-OP7
V
GND
Product data
CC
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