ST16C452IJ68 查看數據表（PDF） - Exar Corporation

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ST16C452IJ68

DUAL UART WITH PARALLEL PRINTER PORT

Exar Corporation 

ST16C452/452PS

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

Transmit

Holding

Registers

Receive

Holding

Registers

Transmit

Shift

Register

Receive

Shift

Register

Printer

Data

Ports

Printer

Control

Logic

TX A,B

RX A,B

PD0-PD7

-STROBE

INIT

-AUTOFDX

-SELCTIN

PE, SELECT

-BUSY, -ACK

ERROR

-RTS

-CD

-DTR

-RI

(-OP1)

INT A,B

INTP

Clock

&

Baud Rate

Generator

-DSR

(-OP2)

-CTS

Rev. 3.20

11

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