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參數(shù)資料
| 型號： | 933774940529 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 2 CHANNEL(S), 1M bps, SERIAL COMM CONTROLLER, PQCC44 |
| 封裝： | PLASTIC, MO-047AC, SOT-187-2, LCC-44 |
| 文件頁數(shù)： | 32/34頁 |
| 文件大?。?/td> | 313K |
| 代理商： | 933774940529 |
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Philips Semiconductors
Product specification
SCN2681
Dual asynchronous receiver/transmitter (DUART)
1998 Sep 04
7
BLOCK DIAGRAM
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
CSRA
CSRB
ACR
CTUR
CHANNEL A
TRANSMIT
HOLDING REG
TRANSMIT
SHIFT REGISTER
RECEIVE
HOLDING REG (3)
RECEIVE
SHIFT REGISTER
MRA1, 2
CRA
SRA
INPUT PORT
CHANGE OF
STATE
DETECTORS (4)
OUTPUT PORT
FUNCTION
SELECT LOGIC
OPCR
TxDA
RxDA
IP0-IP6
OP0-OP7
VCC
GND
CONTROL
TIMING
INTERNAL
DA
T
ABUS
CHANNEL B
(AS ABOVE)
IPCR
ACR
OPR
CTLR
RxDB
TxDB
8
7
SD00085
Figure 2. Block Diagram
BLOCK DIAGRAM
The SCN2681 DUART consists of the following eight major sections:
data bus buffer, operation control, interrupt control, timing,
communications Channels A and B, input port and output port.
Refer to the block diagram.
Data Bus Buffer
The data bus buffer provides the interface between the external and
internal data buses. It is controlled by the operation control block to
allow read and write operations to take place between the controlling
CPU and the DUART.
Operation Control
The operation control logic receives operation commands from the
CPU and generates appropriate signals to internal sections to
control device operation. It contains address decoding and read and
write circuits to permit communications with the microprocessor via
the data bus buffer.
Interrupt Control
A single active-Low interrupt output (INTRN) is provided which is
activated upon the occurrence of any of eight internal events.
Associated with the interrupt system are the Interrupt Mask Register
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