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ST16C2550 Fiches technique(PDF) 6 Page - Exar Corporation

No de pièce ST16C2550
Description  DUAL UART WITH 16-BYTE TRANSMIT AND RECEIVE FIFOS
Download  34 Pages
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Fabricant  EXAR [Exar Corporation]
Site Internet  http://www.exar.com
Logo EXAR - Exar Corporation

ST16C2550 Fiches technique(HTML) 6 Page - Exar Corporation

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ST16C2550
6
Rev. 3.20
SYMBOL DESCRIPTION
Symbol
Pin
Signal
Pin Description
40
44
48
type
XTAL1
16
18
13
I
Crystal or External Clock Input - Functions as a crystal input
or as an external clock input. A crystal can be connected
between this pin and XTAL2 to form an internal oscillator
circuit. This configuration requires an external 1 MW resis-
tor between the XTAL1 and XTAL2 pins. Alternatively, an
external clock can be connected to this pin to provide
custom data rates (see Baud Rate Generator Program-
ming).
XTAL2
17
19
14
O
Output of the Crystal Oscillator or Buffered Clock - (See also
XTAL1). Crystal oscillator output or buffered clock output.
Should be left open if an external clock is connected to
XTAL1.
-CD A-B
38,19 42,21 40,16
I
Carrier Detect (active low) - These inputs are associated
with individual UART channels A through B. A logic 0 on this
pin indicates that a carrier has been detected by the modem
for that channel.
-CTS A-B
36,25 40,28 38,23
I
Clear to Send (active low) - These inputs are associated with
individual UART channels, A through B. A logic 0 on the -
CTS pin indicates the modem or data set is ready to accept
transmit data from the 2550. Status can be tested by reading
MSR bit-4. This pin has no effect on the UART’s transmit or
receive operation.
-DSR A-B
37,22 41,25 39,20
I
Data Set Ready (active low) - These inputs are associated
with individual UART channels, A through B. A logic 0 on
this pin indicates the modem or data set is powered-on and
is ready for data exchange with the UART. This pin has no
effect on the UART’s transmit or receive operation.
-DTR A-B
33,34 37,38 34,35
O
Data Terminal Ready (active low) - These outputs are
associated with individual UART channels, A through B. A
logic 0 on this pin indicates that the 2550 is powered-on and
ready. This pin can be controlled via the modem control
register. Writing a logic 1 to MCR bit-0 will set the -DTR
output to logic 0, enabling the modem. This pin will be a logic
1 after writing a logic 0 to MCR bit-0, or after a reset. This


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