PC87366 Datasheet, PDF(28/240 Page) National Semiconductor (TI) – 128-Pin LPC SuperI/O with System Hardware Monitoring, MIDI and Game Ports

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PC87366 Datasheet, PDF (28/240 Pages) National Semiconductor (TI) – 128-Pin LPC SuperI/O with System Hardware Monitoring, MIDI and Game Ports

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1.0 Signal/Pin Connection and Description (Continued)

1.4.11 Parallel Port

Signal

Pin/s I/O Buffer Type Power Well

Description

ACK

79

I

INT

VDD

Acknowledge. Pulsed low by the printer to indicate that it has

received data from the Parallel Port.

AFD_DSTRB 93

AFD - Automatic Feed. When low, instructs the printer to

automatically feed a line after printing each line. This pin is in

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

O OD14, O14/14

VDD

register bit. An external 4.7 Kâ¦ pull-up resistor should be

attached to this pin.

DSTRB - Data Strobe (EPP). Active low, used in EPP mode

to denote a data cycle. When the cycle is aborted, DSTRB

becomes inactive (high).

BUSY_WAIT 78

I

INT

Busy. Set high by the printer when it cannot accept another

VDD

character.

Wait. In EPP mode, the Parallel Port device uses this active

low signal to extend its access cycle.

ERR

91

I

INT

VDD Error. Set active low by the printer when it detects an error.

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

INIT

89

O OD14, O14/14 VDD TRI-STATE after a 1 is loaded into the corresponding control

register bit. Use an external 4.7 Kâ¦ pull-up resistor.

PD7-5

PD4-3,

PD2, PD1

PD0

80-82

85-86

88, 90

92

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.

PE

77

I

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

76

I

INT

VDD

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

selected.

SLIN_ASTRB 87

STB_WRITE 94

SLIN - Select Input. When low, selects the printer. This signal

is in TRI-STATE after a 0 is loaded into the corresponding

O OD14, O14/14

VDD

control register bit. Uses an external 4.7 Kâ¦ 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 - 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

O OD14, O14/14

VDD

register bit. An external 4.7 Kâ¦ 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).

1.4.12 Power and Ground

Signal

AVSS

AVDD

VBAT

Pin/s I/O Buffer Type Power Well

Description

45

I

AGND

44

I

PWR

30

I

INULR

-

Analog Ground

-

Analog 3.3V Power Supply Provides power to the analog

circuits.

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.

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