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SC28C94 Datasheet(PDF) 4 Page - NXP Semiconductors

Part No. SC28C94
Description  Quad universal asynchronous receiver/transmitter QUART
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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 4 page
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Philips Semiconductors
Product specification
SC28C94
Quad universal asynchronous receiver/transmitter (QUART)
1998 Aug 19
4
BLOCK DIAGRAM
8
D0–D7
RDN
WRN
CEN
A0–A5
RESET
X1/CLK
X2
6
BUS BUFFER
OPERATION CONTROL
ADDRESS
DECODE
R/W CONTROL
TIMING
CHANNEL A
MR 0, 1, 2
CR
SR
INPUT PORT
OUTPUT PORT
OPCR
CSR Rx
CSR Tx
CRYSTAL
OSCILLATOR
POWER UP-DOWN
LOGIC
SAME AS
DUART AB
8 BYTE TRANSMIT
FIFO
TRANSMIT SHIFT
REGISTER
8 BYTE
RECEIVE FIFO
RECEIVE SHIFT
REGISTER
CHANGE-OF-
STATE
DETECTORS (4)
IPCR
ACR
FUNCTION SELECT
LOGIC
CHANNEL B
(AS ABOVE)
TIMING
CLOCK
SELECTORS
COUNTER/
TIMER
ACR
CTUR
CTLR
INTERRUPT CONTROL
IMR
ISR
INTERNAL DATA
BUS
TxDA
RxDA
TxDB
RxDB
1:0
4
TIMING
CONTROL
DACKN
DUART CD
TXDC
TXDD
RXDC
RXDD
I/O[3:0]C
I/O[3:0]D
1:0
I/O[3:0]B
I/O[3:0]A
•VCC
•VSS1
•VSS2
•VSS3
•VSS4
BAUD RATE
GENERATOR
DUART AB
LOGIC
GLOBAL
REGISTERS
IRQN
IACKN
INTERRUPT ARBITRATION
8
DUART
COMMON
AB
18
4
4
4
÷ 2
SD00160
Figure 3. Block Diagram




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