SCC2681 데이터 시트보기 (PDF) - Philips Electronics
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SCC2681 Datasheet PDF : 29 Pages
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Philips Semiconductors
Dual asynchronous receiver/transmitter (DUART)
Product data
SCC2681
SYMBOL
PLCC44
X2
37
PIN
DIP40
33
RxDA
35
31
RxDB
11
10
TxDA
33
30
TxDB
13
11
OP0
OP1
OP2
OP3
OP4
OP5
OP6
OP7
IP0
IP1
IP2
IP3
32
29
14
12
31
28
15
13
30
27
16
14
29
26
17
15
8
7
5
4
40
36
3
2
IP4
43
39
IP5
42
38
IP6
41
37
VCC
GND
n.c.
44
40
22
20
1, 12,
–
34, 23
DIP28
24
22
7
21
8
20
9
–
–
–
–
–
–
–
–
27
–
–
–
–
28
14
–
TYPE
NAME AND FUNCTION
I 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.
I Channel A Receiver Serial Data Input: The least significant bit is received first. “Mark”
is HIGH, “space” is LOW.
I Channel B Receive Serial Data Input: The least significant bit is received first. “Mark”
is HIGH, “space” is LOW.
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.
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.
O Output 0: General purpose output or Channel A request to send (RTSAN,
active-LOW). Can be deactivated automatically on receive or transmit.
O Output 1: General purpose output or Channel B request to send (RTSBN,
active-LOW). Can be deactivated automatically on receive or transmit.
O Output 2: General purpose output or Channel A transmitter 1× or 16× clock output, or
Channel A receiver 1× clock output.
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.
O Output 4: General purpose output or Channel A open-drain, active-LOW,
RxRDYA/FFULLA interrupt output.
O Output 5: General purpose output or Channel B open-drain, active-LOW,
RxRDYB/FFULLB interrupt output.
O Output 6: General purpose output or Channel A open-drain, active-LOW, TxRDYA
interrupt output.
O Output 7: General purpose output or Channel B open-drain, active-LOW, TxRDYB
interrupt output.
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.
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.
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.
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.
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.
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.
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.
I Power Supply: +5V supply input.
I Ground
– Not connected.
2004 Apr 06
4
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