SCC2691 Просмотр технического описания (PDF) - Philips Electronics
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SCC2691 Datasheet PDF : 24 Pages
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Philips Semiconductors
Universal asynchronous receiver/transmitter (UART)
Product specification
SCC2691
DESCRIPTION
The Philips Semiconductors SCC2691 Universal Asynchronous
Receiver/Transmitter (UART) is a single-chip CMOS-LSI
communications device that provides a full-duplex asynchronous
receiver/transmitter. It is fabricated with Philips Semiconductors
CMOS technology which combines the benefits of high density and
low power consumption.
The operating speed of the receiver and transmitter can be selected
independently as one of 18 fixed baud rates, a 16X clock derived
from a programmable counter/timer, or an external 1X or 16X clock.
The baud rate generator and counter/timer can operate directly from
a crystal or from external clock inputs. The ability to independently
program the operating speed of the receiver and transmitter make
the UART particularly attractive for dual-speed channel applications
such as clustered terminal systems.
The receiver is quadruple buffered to minimize the potential of
receiver overrun or to reduce interrupt overhead in interrupt driven
systems. In addition, a handshaking capability is provided to disable
a remote UART transmitter when the receiver buffer is full.
The UART provides a power-down mode in which the oscillator is
frozen but the register contents are stored. This results in reduced
power consumption on the order of several magnitudes.
The UART is fully TTL compatible and operates from a single +5V
power supply.
FEATURES
• Full-duplex asynchronous receiver/transmitter
• Quadruple buffered receiver data register
• Programmable data format:
– 5 to 8 data bits plus parity
– Odd, even, no parity or force parity
– 1, 1.5 or 2 stop bits programmable in 1/16-bit increments
• 16-bit programmable Counter/Timer
• Baud rate for the receiver and transmitter selectable from:
– 22 fixed rates: 50 to 115.2K baud
– Non-standard rates to 115.2kb
– Non-standard user-defined rate derived from programmable
timer/ counter
– External 1X or 16X clock
• Parity, framing, and overrun detection
• False start bit detection
• Line break detection and generation
• Programmable channel mode
– Normal (full-duplex)
– Automatic echo
– Local loopback
– Remote Loopback
• Multi-function programmable 16-bit counter/timer
PIN CONFIGURATIONS
RDN 1
RxD 2
TxD 3
MPO 4
MPI 5
A2 6
A1 7
A0 8
X1/CLK 9
X2 10
RESET 11
GND 12
24 VCC
23 WRN
22 D0
21 D1
N24
AND
D24
PACKAGES
20 D2
19 D3
18 D4
17 D5
16 D6
15 D7
14 CEN
13 INTRN
4
1
26
5
25
A28
PACKAGE
11
12
19
18
Pin Symbol
1
VCC
2
RDN
3
RxD
4
TxD
5
MPO
6
MPI
7
NC
8
NC
9
A2
10 A1
11 A0
12 X1/CLK
13 X2
14 RESET
Pin Symbol
15 GND
16 INTRN
17 CEN
18 D7
19 D6
20 D5
21 D4
22 D3
23 NC
24 D2
25 D1
26 NC
27 D0
28 WRN
SD00122
Figure 1. Pin Configurations
• Single interrupt output with seven maskable interrupting
conditions
• On-chip crystal oscillator
• Low power mode
• TTL compatible
• Single +5V power supply
• Commercial (0°C to +70°C) and industrial (-40°C to +85°C)
temperature versions available
• SOL, PLCC and 300 mil wide DIP packages available
1998 Sep 04
2
853–1078 19971
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