82091AA datasheet(71/204 Pages) INTEL

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82091AA

Bit

Description

BUSY STATUS (BUSYS)

This bit indicates the state of the parallel port interface BUSY signal

When BUSY is asserted BUSYSe0 When BUSY is negated BUSYSe1 This bit is an inverted

version of the parallel port BUSY signal

ACK

STATUS (ACKS)

This bit indicates the state of the parallel port interface ACK

signal This

bit indicates when the peripheral has received a data byte and is ready for another When ACK

asserted ACKSe0 When ACK

is negated ACKSe1 Note that if interrupts are enabled (via bit 4

of the PCON Register) the assertion of the ACK

signal generates an interrupt to the CPU

PERROR STATUS (PERRS)

This bit indicates the state of the parallel port interface PERROR

signal This bit indicates when an error has occurred in the peripheral paper path (eg out of paper)

When PERROR is asserted PERRSe1 When PERROR is negated PERRSe0

SELECT STATUS (SELS)

This bit indicates the state of the parallel port interface SELECT signal

When the SELECT signal is asserted SELSe1 When the SELECT signal is negated SELSe0

FAULT

STATUS (FAULTS)

This bit indicates the state of the parallel port interface FAULT

signal being driven by the peripheral device When the FAULT

signal is asserted FAULTSe0

When the FAULT

signal is negated FAULTSe1

PARALLEL PORT INTERRUPT (PIRQ)

In EPP mode interrupt status is not reported in this register

and this bit is always 1

RESERVED

82091AA Datasheet(PDF) 71 Page - Intel Corporation