scc2681 NXP Semiconductors, scc2681 Datasheet - Page 4

• Manufacturer Part Number: scc2681
• Description: Dual Asynchronous Receiver/transmitter Duart
• Manufacturer: NXP Semiconductors

Philips Semiconductors
2004 Apr 06
SYMBOL
SYMBOL
X2
RxDA
RxDB
TxDA
TxDB
OP0
OP1
OP2
OP3
OP4
OP5
OP6
OP7
IP0
IP1
IP2
IP3
IP4
IP5
IP6
V
GND
n.c.
CC
Dual asynchronous receiver/transmitter (DUART)
PLCC44
34, 23
1, 12,
37
35
33
13
32
14
31
15
30
16
29
17
40
43
42
41
44
22
11
8
5
3
DIP40
PIN
33
31
10
30
29
12
28
13
27
14
26
15
36
39
38
37
40
20
11
7
4
2
–
DIP28
24
22
21
20
27
28
14
7
8
9
–
–
–
–
–
–
–
–
–
–
–
–
–
TYPE
TYPE
O
O
O
O
O
O
O
O
O
O
–
I
I
I
I
I
I
I
I
I
I
I
I
Channel A Receiver Serial Data Input: The least significant bit is received first. “Mark”
Input 2: General purpose input or counter/timer external clock input. Pin has an internal
Crystal 2: Crystal connection. See Figure 7. If a crystal is not used it is best to keep
this pin not connected although it must not be grounded.
is HIGH, “space” is LOW.
Channel B Receive Serial Data Input: The least significant bit is received first. “Mark”
is HIGH, “space” is LOW.
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.
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.
Output 0: General purpose output or Channel A request to send (RTSAN,
active-LOW). Can be deactivated automatically on receive or transmit.
Output 1: General purpose output or Channel B request to send (RTSBN,
active-LOW). Can be deactivated automatically on receive or transmit.
Output 2: General purpose output or Channel A transmitter 1 or 16 clock output, or
Channel A receiver 1 clock output.
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.
Output 4: General purpose output or Channel A open-drain, active-LOW,
RxRDYA/FFULLA interrupt output.
Output 5: General purpose output or Channel B open-drain, active-LOW,
RxRDYB/FFULLB interrupt output.
Output 6: General purpose output or Channel A open-drain, active-LOW, TxRDYA
interrupt output.
Output 7: General purpose output or Channel B open-drain, active-LOW, TxRDYB
interrupt output.
Input 0: General purpose input or Channel A clear to send active-LOW input (CTSAN).
Pin has an internal V
Input 1: General purpose input or Channel B clear to send active-LOW input (CTSBN).
Pin has an internal V
V
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 V
of current.
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 V
current.
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 V
of current.
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 V
current.
Power Supply: +5V supply input.
Ground
Not connected.
CC
pull-up device supplying 1 to 4 A of current.
4
CC
CC
pull-up device supplying 1 to 4 A of current.
pull-up device supplying 1 to 4 A of current.
NAME AND FUNCTION
NAME AND FUNCTION
CC
CC
pull-up device supplying 1 to 4 A of
pull-up device supplying 1 to 4 A of
CC
CC
pull-up device supplying 1 to 4 A
pull-up device supplying 1 to 4 A
SCC2681
Product data