ST16C552CJ68TR-F Ver la hoja de datos (PDF) - Unspecified

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ST16C552CJ68TR-F

DUAL UART WITH 16-BYTE FIFO AND PARALLEL PRINTER PORT

Unspecified 

ST16C552/552A

SYMBOL DESCRIPTION

Symbol

-DSR A/B

-DTR A/B

-RI A/B

-RTS A/B

RX A/B

Pin

31,5

25,11

30,6

24,12

41,62

Signal Type

Pin Description

effect on the transmit or receive operation.

I

Data Set Ready (active low) - These inputs are associated

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

this pin(s) 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.

O

Data Terminal Ready (active low) - These outputs are

associated with individual UART channels, A through B. A

logic 0 on this pin(s) indicates that the 552/552A is powered-

on and ready. This pin can be controlled via the modem

control register for channel(s) A-B. 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 pin has no effect on the UART’s

transmit or receive operation.

I

Ring Indicator (active low) - These inputs are associated

with 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 552. 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

Rev. 3.40

7

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