PC87360 datasheet(23/168 Pages) NSC

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1.0 Signal/Pin Connection and Description (Continued)

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1.4.10

Power and Ground

INIT

OD14,O14/14

VDD

Initialize. When low, initializes the printer. This signal is in

TRI-STATE after a 1 is loaded into the corresponding control

Ω pull-up resistor.

PD7-5

PD4-3,

PD2, PD1

PD0

80-82

85-86

88, 90

I/O

INT/

OD14,O14/14

VDD

Parallel Port Data. Transfer data to and from the peripheral

data bus and the appropriate Parallel Port data register. These

signals have a high current drive capability.

INT

VDD

Paper End. Set high by the printer when it is out of paper. This

pin has an internal weak pull-up or pull-down resistor.

SLCT

INT

VDD

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

selected.

SLIN_ASTRB 87

OD14,O14/14

VDD

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. Uses an external 4.7 K

Ω pull-up resistor.

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 94

OD14,O14/14

VDD

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

Ω pull-up resistor should be

employed.

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 Power Well

Description

VBAT

INULR

Battery Power Supply. Provides battery back-up to the System

Wake-Up Control registers, when VSB is lost (power-fail). The

pin is connected to the internal logic through a series resistor

for UL protection.

VDD

20, 52,

83, 115

PWR

Main 3.3V Power Supply

VSB

PWR

Standby 3.3V Power Supply. Provides power to the Wake-Up

Control circuitry, while the main power supply is turned off.

VSS

19, 51,

84, 116

GND

Ground

Signal

Pin/s

I/O

Buffer Type Power Well

Description

PC87360 Datasheet(PDF) 23 Page - National Semiconductor (TI)

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