ST162552 查看數據表（PDF） - Exar Corporation

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ST162552

DUAL ASYNCHRONOUS RECEIVER/TRANSMITTER WITH FIFOs

Exar Corporation 

ST16C2552

SYMBOL DESCRIPTION

Symbol

CTS* A/B

DSR* A/B

CD* A/B

RI* A/B

VCC

GND

Pin

40,28

41,29

42,30

43,31

33,44

12,22

Signal Type

Pin Description

I

Clear to send A/B (active low). The CTS* signal is a

MODEM control function input whose conditions can be

tested by reading the MSR BIT-4. CTS* has no effect on the

transmit or receive operation.

I

Data set ready A/B (active low). A low on this pin indicates

the MODEM is ready to exchange data with UART. This pin

does not have any effect on the transmit or receive opera-

tion.

I

Carrier detect A/B (active low). A low on this pin indicates

the carrier has been detected by the modem.

I

Ring detect indicator A/B (active low). A low on this pin

indicates the modem has received a ringing signal from

telephone line.

I

Power supply input.

O

Signal and power ground.

PROGRAMMING TABLE

A2 A1 A0

0

0

0

0

0

1

0

1

0

0

1

1

1

0

0

1

0

1

1

1

0

1

1

1

0

0

0

0

0

1

0

1

0

READ MODE

Receive Holding Register

Interrupt Status Register

Line Status Register

Modem Status Register

Scratchpad Register

Alternate Function Register

WRITE MODE

Transmit Holding Register

Interrupt Enable Register

FIFO Control Register

Line Control Register

Modem Control Register

Scratchpad Register

LSB of Divisor Latch

MSB of Divisor Latch

Alternate Function Register

3-139

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