ST16C452IJ68 查看數據表（PDF） - Exar Corporation

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ST16C452IJ68

DUAL UART WITH PARALLEL PRINTER PORT

Exar Corporation 

ST16C452/452PS

SYMBOL DESCRIPTION

Symbol

-RTS A/B

RX A/B

TX A/B

Pin

24,12

41,62

26,10

Signal Type

Pin Description

individual UART channels, A through B. A logic 0 on this pin(s)

indicates the modem has received a ringing signal from the

telephone line(s). A logic 1 transition on this input pin will

generate an interrupt for the ringing channel(s). This pin does

not have any effect on the transmit or receive operation.

O

Request to Send (active low) - These outputs are associated

with individual UART channels, A through B. A logic 0 on the

-RTS pin(s) indicates the transmitter has data ready and

waiting to send for the given channel(s). 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 does not have any effect on the

transmit or receive operation.

I

Receive Data Input, RX A-B. - These inputs are associated

with individual serial channel(s) to the 452. The RX signal

will be a logic 1 during reset, idle (no data), or when the

transmitter is disabled. During the local loop-back mode,

the RX input pins are disabled and TX data is internally

connected to the UART RX Inputs, internally.

O

Transmit Data, TX A-B - These outputs are associated with

individual serial transmit channel(s) from the 452/452PS.

The TX signal will be a logic 1 during reset, idle (no data),

or when the transmitter is disabled. During the local loop-

back mode, the TX output pins are disabled and TX data is

internally connected to the UART RX Inputs.

Rev. 3.20

7

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