SC16C2550 datasheet(8/46 Pages) PHILIPS

Part #	SC16C2550

Description	Dual UART with 16 bytes of transmit and receive FIFOs and infrared (IrDA) encoder/decoder

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Manufacturer	PHILIPS [NXP Semiconductors]

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Philips Semiconductors

SC16C2550

Dual UART with 16 bytes of transmit and receive FIFOs and IrDA

encoder/decoder

Product data

Rev. 03 — 19 June 2003

8 of 46

9397 750 11621

XTAL2

17

19

14

O

Output of the crystal oscillator or buffered clock. (See also XTAL1.)

Crystal oscillator output or buffered clock output. Should be left open if an

external clock is connected to XTAL1. For extended frequency operation,

this pin should be tied to VCC via a 2 kΩ resistor.

CDA,

CDB

38, 19 42, 21

40, 16

I

Carrier Detect (Active-LOW). These inputs are associated with individual

UART channels A through B. A logic 0 on this pin indicates that a carrier

has been detected by the modem for that channel.

CTSA,

CTSB

36, 25 40, 28

38, 23

I

Clear to Send (Active-LOW). These inputs are associated with individual

UART channels, A through B. A logic 0 on the CTS pin indicates the

modem or data set is ready to accept transmit data from the SC16C2550.

Status can be tested by reading MSR[4]. This pin has no effect on the

UART’s transmit or receive operation.

DSRA,

DSRB

37, 22 41, 25

39, 20

I

Data Set Ready (Active-LOW). These inputs are associated with

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

DTRA,

DTRB

33, 34 37, 38

34, 35

O

Data Terminal REady (Active-LOW). These outputs are associated with

individual UART channels, A through B. A logic 0 on this pin indicates that

the SC16C2550 is powered-on and ready. This pin can be controlled via

the modem control register. Writing a logic 1 to MCR[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[0], or after a reset. This pin has no effect on the UART’s

transmit or receive operation.

RIA, RIB

39, 23 43, 26

41, 21

I

Ring Indicator (Active-LOW). These inputs are associated with individual

UART channels, A through B. A logic 0 on this pin indicates the modem has

received a ringing signal from the telephone line. A logic 1 transition on this

input pin will generate an interrupt.

RTSA,

RTSB

32, 24 36, 27

33, 22

O

Request to Send (Active-LOW). These outputs are associated with

individual UART channels, A through B. A logic 0 on the RTS pin indicates

the transmitter has data ready and waiting to send. Writing a logic 1 in the

modem control register MCR[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 has no

effect on the UART’s transmit or receive operation.

RXA, RXB 10, 9

11, 10

5, 4

I

Receive data A, B. These inputs are associated with individual serial

channel data to the SC16C2550 receive input circuits, A-B. 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 pin is disabled and

TX data is connected to the UART RX input, internally.

TXA, TXB 11, 12 13, 14

7, 8

O

Transmit data A, B. These outputs are associated with individual serial

transmit channel data from the SC16C2550. 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 pin is disabled and TX data is

internally connected to the UART RX input.

Table 2:

Pin description…continued

Symbol

Type Description

DIP40 PLCC44 LQFP48

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