PC87382 datasheet(11/72 Pages) NSC

11 / 72 page

1.0 Signal/Pin Connection and Description (Continued)

Revision 1.2

www.national.com

1.3.4

Infrared (IR)

1.3.5

Serial Port (SP1)

1.3.6

General-Purpose Input/Output (GPIO) Ports

Signal

Pin(s)

I/O

Buffer Type

Description

IRRX1

INTS

IR Receive 1. Primary input to receive serial data from the IR transceiver.

IRRX2_IRSL0

I/O

INTS/O3/6

IRRX2 - IR Receive 2. Auxiliary IR receiver input to support a second

transceiver.

IRSL0 - IR Select. Output used to control the IR transceiver.

IRTX

O6/12

IR Transmit. IR serial output data.

Signal

Pin(s)

I/O

Buffer Type

Description

CTS1

INTS

Clear to Send. When low, indicates that the modem or other data transfer

device is ready to exchange data.

DCD1

INTS

Data Carrier Detected. When low, indicates that the modem or other data

transfer device has detected the data carrier.

DSR1

INTS

Data Set Ready. When low, indicates that the data transfer device, e.g.,

modem, is ready to establish a communications link.

DTR1_BOUT1 2

O3/6

Data Terminal Ready. When low, indicates to the modem or other data

transfer device that the UART is ready to establish a communications link.

Baud Output. Provides the associated serial channel baud rate generator

output signal if Test Mode is selected, i.e., if bit 7 of the EXCR1 register is

set.

RI1

INTS

Ring Indicator. When low, indicates that a telephone ring signal was

received by the modem. It is monitored during power-off for wake-up event

detection.

RTS1

O3/6

Request to Send. When low, indicates to the modem or other data

transfer device that the corresponding UART is ready to exchange data. A

system reset sets this signal to inactive high; a loopback operation holds it

inactive.

SIN1

INTS

Serial Input. Receives composite serial data from the communications link

(peripheral device, modem or other data transfer device).

SOUT1

O3/6

Serial Output. Sends composite serial data to the communications link

(peripheral device, modem or other data transfer device). These signals

are set active high after a system reset.

Signal

Pin(s)

I/O

Buffer Type

Description

GPIO00-04

11, 12,

13, 14,

I/O

INTS/

OD6,O3/6

General-Purpose I/O Port 0, bits 0-4. Each pin is configured independent-

ly as input or I/O, with or without static pull-up, and with either open-drain or

push-pull output type. The port supports interrupt assertion, and each pin

can be enabled or masked as an interrupt source.

GPIO20-21,

GPIO23

17, 21

I/O

INTS/

OD6,O3/6

General-Purpose I/O Port 2, bits 0,1,3. Same as Port 0, without

interrupt support.

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