PC87383 datasheet(11/77 Pages) NSC

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1.0 Signal/Pin Connection and Description (Continued)

Revision 1.1

www.national.com

1.3.4

Infrared (IR)

1.3.5

Serial Port (SP1)

SLCT

INT

Select. Set active high by the printer when the printer is selected.

SLIN_ASTRB 55

OD14,O14/14 SLIN - Select Input. When low, selects the printer. This signal is in

TRI-STATE after a 0 is loaded into the corresponding control register

bit. An external 4.7 K

Ω pull-up resistor must be connected to this pin.

ASTRB - Address Strobe (EPP). Active low, used in EPP mode to

denote an address or data cycle. When the cycle is aborted, ASTRB

becomes inactive (high).

STB_WRITE

OD14,O14/14 STB - Data Strobe. When low, Indicates to the printer that valid data

is available at the printer port. This signal is in TRI-STATE after a 0 is

loaded into the corresponding control register bit. An external 4.7 K

Ω

pull-up resistor must be connected to this pin.

WRITE - Write Strobe. Active low, used in EPP mode to denote an

address or data cycle. When the cycle is aborted, WRITE becomes

inactive (high).

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 10

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 4

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

PC87383 Datasheet(PDF) 11 Page - National Semiconductor (TI)

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