ST162552 datasheet(5/28 Pages) EXAR

5 / 28 page

3-139

ST16C2552

Symbol

Signal Type

Pin Description

SYMBOL DESCRIPTION

CTS* A/B

40,28

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.

DSR* A/B

41,29

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.

CD* A/B

42,30

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

the carrier has been detected by the modem.

RI* A/B

43,31

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

indicates the modem has received a ringing signal from

telephone line.

VCC

33,44

Power supply input.

GND

12,22

Signal and power ground.

PROGRAMMING TABLE

READ MODE

WRITE MODE

Receive Holding Register

Transmit Holding Register

Interrupt Enable Register

Interrupt Status Register

FIFO Control Register

Line Control Register

Modem Control Register

Line Status Register

Modem Status Register

Scratchpad Register

LSB of Divisor Latch

MSB of Divisor Latch

Alternate Function Register

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