scn2661 NXP Semiconductors, scn2661 Datasheet - Page 5

• Manufacturer Part Number: scn2661
• Description: Enhanced Programmable Communications Interface Epci
• Manufacturer: NXP Semiconductors

Philips Semiconductors
the communication technique) and outputs a composite serial
stream of data on the TxD output pin.
Modem Control
The modern control section provides interfacing for three input
signals and three output signals used for “handshaking” and status
indication between the CPU and a modem.
Table 1.
68661A (BRCLK = 4.9152MHz)
68661B (BRCLK = 4.9152MHz)
1994 Apr 27
Enhanced programmable communications
interface (EPCI)
MR23–20
MR23–20
0000
0001
0010
0100
0101
1000
1001
1010
0000
0001
0010
0100
0101
1000
1001
1010
0011
0110
0111
1011
1100
1101
1110
0011
0110
0111
1011
1100
1101
1110
1111
1111
Baud Rate Generator Characteristics
BAUD RATE
BAUD RATE
19200
19200
38400
134.5
134.5
1050
1200
1800
2000
2400
4800
9600
1200
1800
2000
2400
4800
9600
45.5
110
150
200
300
600
110
150
300
600
50
75
50
75
ACTUAL FREQUENCY
ACTUAL FREQUENCY
16X CLOCK
16X CLOCK
0.7279kHz
16.8329
28.7438
31.9168
28.7438
31.9168
0.8kHz
1.7598
1.7598
2.152
153.6
307.2
2.152
153.6
307.2
614.4
19.2
38.4
76.8
19.2
38.4
76.8
1.2
2.4
3.2
4.8
9.6
0.8
1.2
2.4
4.8
9.6
5
SYN/DLE Control
This section contains control circuitry and three 8-bit registers
storing the SYN1, SYN2, and DLE characters provided by the CPU.
These registers are used in the synchronous mode of operation to
provide the characters required for synchronization, idle fill and data
transparency.
PERCENT
PERCENT
ERROR
ERROR
–0.01
0.196
–0.19
–0.26
0.005
–0.01
–0.19
–0.26
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SCN2661/SCN68661
Product specification
DIVISOR
DIVISOR
6144
4096
2793
2284
2048
1536
1024
6752
6144
4096
2793
2284
2048
1024
512
292
256
171
154
128
512
256
171
154
128
64
32
16
64
32
16
8