PC97338VLJ datasheet(124/221 Pages) NSC

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TABLE 62. Parallel Port Reset States

4.2.1

Standard Parallel Port (SPP)

Modes Register Set

All SPP mode port operation is controlled by three

registers. Table 63 shows the registers of the parallel

port in the Standard Parallel Port (SPP) modes.

The register bits assignments are compatible with the

assignments in existing SPP devices.

TABLE 63. Standard Parallel Port Registers

4.2.2

SPP Mode Parallel Port Register

Bitmaps

4.2.3

Data Register (DTR), Offset 0

This bidirectional data port transfers 8-bit data in the

direction determined by bit 7 of configuration Register

PTR and bit 5 of SPP register CTR.

Bit 7 of the PTR selects the port mode - compatible

mode, with no data input capability, or extended

mode, having data input capability.

Bit 5 of the CTR determines the direction of the data

flow - whether from the Data register DTR to the sys-

tem, or from DTR to the external pins PD7-0.

Signal

Reset Control

State After Reset

SLIN

TRI-STATE

INIT

Zero

AFD

TRI-STATE

STB

TRI-STATE

IRQ5,7

TRI-STATE

Offset A1

A0 Symbol Description

R/W

DTR

Data

R/W

STR

Status

CTR

Control

R/W

TRI-STATE

654

Reset

Required

Data Register

(DTR)

Offset 0

654

Reset

Required

Status Register

(STR)

Offset 1

IRQ Status

SLCT Status

PE Status

ACK Status

BUSY Status

Time-Out Status

Reserved

ERR Status

654

Reset

Required

Control Register

(CTR)

Offset 2

Printer Initialization Control(INIT)

Interrupt Enable

Direction Control

Reserved

Data Strobe Control

Automatic Line Feed Control

Parallel Port Input Control

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