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SCC2681T Datasheet(PDF) 5 Page - NXP Semiconductors

Part # SCC2681T
Description  Dual asynchronous receiver/transmitter (DUART)
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

SCC2681T Datasheet(HTML) 5 Page - NXP Semiconductors

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Product data
SCC2681T
Dual asynchronous receiver/transmitter (DUART)
2004 Apr 06
5
MNEMONIC
NAME AND FUNCTION
TYPE
PIN
TxDA
33
O
Channel A Transmitter Serial Data Output: The least significant bit is transmitted first. This output is held
in the ‘mark’ condition when the transmitter is disabled, idle, or when operating in local loopback mode.
‘Mark’ is HIGH, ‘space’ is LOW.
TxDB
13
O
Channel B Transmitter Serial Data Output: The least significant bit is transmitted first. This output is
held in the ‘mark’ condition when the transmitter is disabled, idle, or when operating in local loopback
mode. ‘Mark’ is HIGH, ‘space’ is LOW.
OP0
32
O
Output 0: General purpose output, or channel A request to send (RTSAN, active-LOW). Can be
deactivated automatically on receive or transmit.
OP1
14
O
Output 1: General purpose output, or channel B request to send (RTSBN, active-LOW). Can be
deactivated automatically on receive or transmit.
OP2
31
O
Output 2: General purpose output, or channel A transmitter 1
× or 16× clock output, or channel A
receiver 1
× clock output.
OP3
15
O
Output 3: General purpose output, or open-drain, active-LOW counter/timer interrupt output, or channel
B transmitter 1
× clock output, or channel B receiver 1× clock output.
OP4
30
O
Output 4: General purpose output, or channel A open-drain, active-LOW, RxRDYA/FFULLA interrupt
output.
OP5
16
O
Output 5: General purpose output, or channel B open-drain, active-LOW, RxRDYB/FFULLB interrupt
output.
OP6
29
O
Output 6: General purpose output, or channel A open-drain, active-LOW, TxRDYA interrupt output.
OP7
17
O
Output 7: General purpose output, or channel B open-drain, active-LOW TxRDYB interrupt output.
IP0
8
I
Input 0: General purpose input, or channel A clear to send active-LOW input (CTSAN). Pin has an
internal VCC pull-up device supplying 1 to 4 µA of current.
IP1
5
I
Input 1: General purpose input, or channel B clear to send active-LOW input (CTSBN). Pin has an
internal VCC pull-up device supplying 1 to 4 µA of current.
IP2
40
I
Input 2: General purpose input, or counter/timer external clock input. Pin has an internal VCC pull-up
device supplying 1 to 4
µA of current.
IP3
3
I
Input 3: General purpose input, or channel A transmitter external clock input (TxCA). When the external
clock is used by the transmitter, the transmitted data is clocked on the falling edge of the clock. Pin has
an internal VCC pull-up device supplying 1 to 4 µA of current.
IP4
43
I
Input 4: General purpose input, or channel A receiver external clock input (RxCA). When the external
clock is used by the receiver, the received data is sampled on the rising edge of the clock. Pin has an
internal VCC pull-up device supplying 1 to 4 µA of current.
IP5
42
I
Input 5: General purpose input, or channel B transmitter external clock input (TxCB). When the external
clock is used by the transmitter, the transmitted data is clocked on the falling edge of the clock. Pin has
an internal VCC pull-up device supplying 1 to 4 µA of current.
IP6
41
I
Input 6: General purpose input, or channel B receiver external clock input (RxCB). When the external
clock is used by the receiver, the received data is sampled on the rising edge of the clock. Pin has an
internal VCC pull-up device supplying 1 to 4 µA of current.
VCC
44
I
Power Supply: +5 V supply input.
GND
22
I
Ground
n.c.
1, 12, 23,
34
not connected


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