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ST16C452CJ68PS Folha de dados(PDF) 11 Page - Exar Corporation

Nome de Peças ST16C452CJ68PS
Descrição Electrónicos  DUAL UART WITH PARALLEL PRINTER PORT
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Fabricante Electrônico  EXAR [Exar Corporation]
Página de início  http://www.exar.com
Logo EXAR - Exar Corporation

ST16C452CJ68PS Folha de dados(HTML) 11 Page - Exar Corporation

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ST16C452/452PS
Rev. 3.20
available at the user data interface, D0-D7. The user
optionally compares the received data to the initial
transmitted data for verifying error free operation of
the UART TX/RX circuits.
In this mode, the receiver and transmitter interrupts
are fully operational. The Modem Control Interrupts are
also operational. However, the interrupts can only be
read using lower four bits of the Modem Control Register
(MCR bits 0-3) instead of the four Modem Status
Register bits 4-7. The interrupts are still controlled by
the IER.
Figure 6, INTERNAL LOOP-BACK MODE DIAGRAM
D0-D7
-IOR
-IOW
-RESET
BIDEN
A0-A2
-CSA
-CSB
-CSP
INT A,B
INTP
TX A,B
RX A,B
Transmit
Holding
Registers
Transmit
Shift
Register
Receive
Holding
Registers
Receive
Shift
Register
Clock
&
Baud Rate
Generator
Printer
Data
Ports
PD0-PD7
Printer
Control
Logic
-STROBE
INIT
-AUTOFDX
-SELCTIN
PE, SELECT
-BUSY, -ACK
ERROR
-CTS
-RTS
-DTR
-DSR
-RI
-CD
(-OP1)
(-OP2)


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