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ST16C454 Scheda tecnica(PDF) 7 Page - Exar Corporation

Il numero della parte ST16C454
Spiegazioni elettronici  QUAD UNIVERSAL ASYNCHRONOUS RECEIVER/TRANSMITTER (UART)
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Produttore elettronici  EXAR [Exar Corporation]
Homepage  http://www.exar.com
Logo EXAR - Exar Corporation

ST16C454 Scheda tecnica(HTML) 7 Page - Exar Corporation

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ST16C454
7
Rev. 3.31
-CD A-B
9,27
-CD C-D
43,61
I
Carrier Detect (active low) - These inputs are associated with
individual UART channels A through D. A logic 0 on this pin indicates
that a carrier has been detected by the modem for that channel.
-CTS A-B
11,25
-CTS C-D
45,59
I
Clear to Send (active low) - These inputs are associated with
individual UART channels, A through D. A logic 0 on the -CTS pin
indicates the modem or data set is ready to accept transmit data
from the 454. Status can be tested by reading MSR bit-4.
-DSR A-B
10,26
-DSR C-D
44,60
I
Data Set Ready (active low) - These inputs are associated with
individual UART channels, A through D. 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. This pin has no effect on the
UART’s transmit or receive operation.
-DTR A-B
12,24
-DTR C-D
46,58
O
Data Terminal Ready (active low) - These inputs are associated
with individual UART channels, A through D. A logic 0 on this pin
indicates that the 454 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. This pin has
no effect on the UART’s transmit or receive operation.
-RI A-B
8,28
-RI C-D
42,62
I
Ring Indicator (active low) - These inputs are associated with
individual UART channels, A through D. A logic 0 on this pin
indicates the modem has received a ringing signal from the
telephone line. A logic 1 transition on this input pin will generate an
interrupt.
-RTS A-B
14,22
-RTS C-D
48,56
O
Request to Send (active low) - These outputs are associated with
individual UART channels, A through D. A logic 0 on the -RTS pin
indicates the transmitter has data ready and waiting to send.
Writing a logic 1 in the modem control register (MCR bit-1) will set
this pin to a logic 0 indicating data is available. After a reset this pin
will be set to a logic 1. This pin has no effect on the UART’s transmit
Symbol
Pin
Signal
Pin Description
type
SYMBOL DESCRIPTION


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