82091AA Datasheet, PDF (68/204 Pages) Intel Corporation – ADVANCED INTEGRATED PERIPHERAL (AIP)

82091AA
Bit
Description
7 6 RESERVED
5 RESERVED (ISA-COMPATIBLE MODE) Not used and undefined when read Writes have no affect
on parallel port operations
DIRECTION (DIR ) (PS 2-COMPATIBLE MODE) This bit is used to control the direction of data
transfer on the parallel port data bus (PD 7 0 ) When DIR ^e0 PD 7 0 are outputs When
DIR ^e1 PD 7 0 are inputs
4 ACK INTERRUPT ENABLE (ACKINTEN) ACKINTEN enables CPU interrupts (via either IRQ5 or
IRQ7) to be generated when the ACK signal on the parallel port interface is asserted When
ACKINTEN^e1 a CPU interrupt is generated when ACK is asserted When ACKINTEN^e0 the
ACK interrupt is disabled
3 SELECTIN CONTROL (SELINC) This bit controls the SELECTIN signal SELINC is set to 1 to
select the printer When SELINC^e1 the SELECTIN signal is asserted When SELINC^e0 the
SELECTIN signal is negated
2 INIT CONTROL (INITC) This bit controls the INIT signal When INITC^e1 the INIT signal is
negated When INITC^e0 the INIT signal is asserted
1 AUTOFD CONTROL (AUTOFDC) This bit controls the AUTOFD signal AUTOFDC is set to 1 to
instruct the printer to advance the paper one line each time a carriage return is received When
AUTOFDC^e1 the AUTOFD signal is asserted When AUTOFDC^e0 the AUTOFD signal is
negated
0 STROBE CONTROL (STROBEC) This bit controls the STROBE signal The STROBE signal
is set active to instruct the printer to accept the character being presented on the data lines When
STROBEC^e1 the STROBE signal is asserted When STROBEC^e0 the STROBE signal is
negated
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