ST162552 Ver la hoja de datos (PDF) - Exar Corporation

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ST162552

DUAL ASYNCHRONOUS RECEIVER/TRANSMITTER WITH FIFOs

Exar Corporation 

ST16C2552

SYMBOL DESCRIPTION

Symbol

INT A/B

MF* A/B

TXRDY* A/B

RTS* A/B

DTR* A/B

RESET

Pin

34,17

35,19

1,32

36,23

37,27

21

Signal Type

Pin Description

O

Interrupt output A/B. (active high) This pin goes high (when

enabled by the interrupt enable register) whenever a re-

ceiver error, receiver data available, transmitter empty, or

modem status condition flag is detected.

O

OP2* (interrupt enable), BAUDOUT* and RXRDY* outputs.

These outputs are multiplexed via Alternate Function Reg-

ister. When output enable function is selected the MF* pin

stays high when INT out pin is set to three state mode and

goes low when INT pin is enabled. See bit-3 modem control

register (MCR bit-3). When BAUDOUT function is selected,

the 16 X TX/RX Baud rate clock output is generated.

RXRDY function can be selected to use to request a DMA

transfer of data from the Receive data FIFO. OP2* is the

default signal and it is selected immediately after master

reset or power-up.

O

Transmit ready. (active low) This pin goes high when the

transmit FIFO of the ST16C2552 is full. It can be used as a

single or multi-transfer.

O

Request to send A/B (active low). To indicate that the

transmitter has data ready to send. Writing a “1” in the

modem control register (MCR bit-1 ) will set this pin to a low

state. After the reset this pin will be set to high. Note that

this pin does not have any effect on the transmit or receive

operation.

O

Data terminal ready A/B (active low). To indicate that

ST16C2552 is ready to receive data. This pin can be

controlled via the modem control register (MCR bit-0).

Writing a “1” at the MCR bit-0 will set the DTR* output to low.

This pin will be set to high state after writing a “0” to that

register or after the reset . Note that this pin does not have

any effect on the transmit or receive operation.

I

Master reset. (active high) A high on this pin will reset all the

outputs and internal registers. The transmitter output and

the receiver input will be disabled during reset time.

3-138

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