scc2681t NXP Semiconductors, scc2681t Datasheet - Page 3

• Manufacturer Part Number: scc2681t
• Description: Dual Asynchronous Receiver/transmitter Duart
• Manufacturer: NXP Semiconductors

Refer to SCC2681 for functional description.
Philips Semiconductors
BLOCK DIAGRAM
NOTE:
2004 Apr 06
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
SCC2681T
SD00099
TxDA
RxDA
TxDB
RxDB
IP0-IP6
OP0-OP7
V
GND
Product data
CC