SCN2661 Datasheet, PDF (5/19 Pages) NXP Semiconductors – Enhanced programmable communications interface EPCI

Philips Semiconductors
Enhanced programmable communications
interface (EPCI)
Product specification
SCN2661/SCN68661
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.
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.
Table 1. Baud Rate Generator Characteristics
68661A (BRCLK = 4.9152MHz)
MR23–20
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
BAUD RATE
50
75
110
134.5
150
200
300
600
1050
1200
1800
2000
2400
4800
9600
19200
ACTUAL FREQUENCY
16X CLOCK
0.8kHz
1.2
1.7598
2.152
2.4
3.2
4.8
9.6
16.8329
19.2
28.7438
31.9168
38.4
76.8
153.6
307.2
PERCENT
ERROR
—
—
–0.01
—
—
—
—
—
0.196
—
–0.19
–0.26
—
—
—
—
DIVISOR
6144
4096
2793
2284
2048
1536
1024
512
292
256
171
154
128
64
32
16
68661B (BRCLK = 4.9152MHz)
MR23–20
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
BAUD RATE
45.5
50
75
110
134.5
150
300
600
1200
1800
2000
2400
4800
9600
19200
38400
ACTUAL FREQUENCY
16X CLOCK
0.7279kHz
0.8
1.2
1.7598
2.152
2.4
4.8
9.6
19.2
28.7438
31.9168
38.4
76.8
153.6
307.2
614.4
PERCENT
ERROR
0.005
—
—
–0.01
—
—
—
—
—
–0.19
–0.26
—
—
—
—
—
DIVISOR
6752
6144
4096
2793
2284
2048
1024
512
256
171
154
128
64
32
16
8
1994 Apr 27
5