scn68681 NXP Semiconductors, scn68681 Datasheet - Page 4
scn68681
Manufacturer Part Number
scn68681
Description
Dual Asynchronous Receiver/transmitter Duart
Manufacturer
NXP Semiconductors
Datasheet
1.SCN68681.pdf
(28 pages)
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Philips Semiconductors
BLOCK DIAGRAM
2004 Mar 02
Dual asynchronous receiver/transmitter (DUART)
DTACKN
RESETN
X1/CLK
IACKN
INTRN
D0–D7
A1–A4
R/WN
CSN
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
IVR
U
Figure 2. Block Diagram
4
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
STATE
OPCR
MR1, 2
OPR
CRA
SRA
IPCR
ACR
6
8
SCN68681
SD00108
TxDA
RxDA
TxDB
RxDB
IP0-IP5
OP0-OP7
V
GND
Product data
CC
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