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SCC2681 Datasheet(PDF) 3 Page - NXP Semiconductors

Part No. SCC2681
Description  Dual asynchronous receiver/transmitter (DUART)
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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SCC2681 Datasheet(HTML) 3 Page - NXP Semiconductors

 
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Philips Semiconductors
Product data
SCC2681
Dual asynchronous receiver/transmitter (DUART)
2004 Apr 06
3
PIN CONFIGURATIONS
PIN/FUNCTION
PIN/FUNCTION
1NC
23 NC
2
A0
24 INTRN
3
IP3
25 D6
4A1
26 D4
5
IP1
27 D2
6A2
28 D0
7
A3
29 OP6
8
IP0
30 OP4
9
WRN
31 OP2
10 RDN
32 OP0
11
RXDB
33 TXDA
12 NC
34 NC
13 TXDB
35 RXDA
14 OP1
36 X1/CLK
15 OP3
37 X2
16 OP5
38 RESET
17 OP7
39 CEN
18 D1
40 IP2
19 D3
41 IP6
20 D5
42 IP5
21 D7
43 IP4
22 GND
44 VCC
24
23
22
21
20
19
18
17
16
15
28
27
12
10
11
9
8
7
6
5
4
3
2
1
14
13
26
25
29
30
31
32
33
34
35
36
37
38
39
40
DIP
VCC
IP4
IP5
IP6
IP2
CEN
RESET
X2
X1/CLK
RXDA
TXDA
OP0
OP2
OP4
OP6
D0
D2
D4
D6
INTRN
A0
IP3
A1
IP1
A2
A3
IP0
WRN
RDN
RXDB
TXDB
OP1
OP3
OP5
OP7
D1
D3
D5
D7
GND
24
23
22
21
20
19
18
17
16
15
28
27
12
10
11
9
8
7
6
5
4
3
2
1
14
13
26
25
VCC
IP2
CEN
RESET
X2
X1/CLK
RXDA
TXDA
OP0
D0
D2
D4
D6
INTRN
GND
D7
D5
D3
D1
OP1
TXDB
RXDB
RDN
WRN
A3
A2
A1
A0
DIP
1
39
17
28
40
29
18
7
PLCC
6
TOP VIEW
INDEX
CORNER
SD00723
Figure 1. Pin configurations
PIN DESCRIPTION
SYMBOL
PIN
TYPE
NAME AND FUNCTION
SYMBOL
PLCC44
DIP40
DIP28
TYPE
NAME AND FUNCTION
D0–D7
28, 18,
27, 19,
26, 20,
25, 21
25, 16,
24, 17,
23, 18,
22, 19
19, 10,
18, 11,
17, 12,
16, 13
I/O
Data Bus: Bidirectional 3-State data bus used to transfer commands, data and status
between the DUART and the CPU. D0 is the least significant bit.
CEN
39
35
26
I
Chip Enable: Active-LOW input signal. When LOW, data transfers between the CPU
and the DUART are enabled on D0-D7 as controlled by the WRN, RDN and A0-A3
inputs. When HIGH, places the D0-D7 lines in the 3-State condition.
WRN
9
8
5
I
Write Strobe: When LOW and CEN is also LOW, the contents of the data bus is
loaded into the addressed register. The transfer occurs on the rising edge of the signal.
RDN
10
9
6
I
Read Strobe: When LOW and CEN is also LOW, causes the contents of the
addressed register to be presented on the data bus. The read cycle begins on the
falling edge of RDN.
A0–A3
2, 4, 6, 7
1, 3, 5,
6
1–4
I
Address Inputs: Select the DUART internal registers and ports for read/write
operations.
RESET
38
34
25
I
Reset: A HIGH level clears internal registers (SRA, SRB, IMR, ISR, OPR, OPCR), puts
OP0–OP7 in the HIGH state, stops the counter/timer, and puts Channels A and B in the
inactive state, with the TxDA and TxDB outputs in the mark (HIGH) state. Clears Test
modes, sets MR pointer to MR1.
INTRN
24
21
15
O
Interrupt Request: Active-LOW, open-drain, output which signals the CPU that one or
more of the eight maskable interrupting conditions are true.
X1/CLK
36
32
23
I
Crystal 1: Crystal connection or an external clock input. A crystal of a clock the
appropriate frequency (nominally 3.6864 MHz) must be supplied at all times. For crystal
connections see Figure 7, Clock Timing.


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