Motorola MVME1X7P - Manual (Page 237)

Programming Model
http://www.motorola.com/computer/literature 3-39
3
Programming the Printer Port
This section provides addresses and bit level descriptions of the printer
port control, status, and data registers.
Printer ACK Interrupt Control Register
IL2-IL0 These three bits select the interrupt level for the printer
ACK. Level 0 does not generate an interrupt.
ICLR In edge-sensitive mode, writing a logic 1 to this bit clears
the INT status bit. This bit has no function in level-
sensitive mode. This bit is always read as zero.
IEN When this bit is high, the interrupt is enabled. The
interrupt is disabled when this bit is low.
INT When this bit is high, a printer ACK interrupt is being
generated at the level programmed in IL2-IL0 (if
nonzero).
E/L* When this bit is high, the interrupt is edge-sensitive. The
interrupt is level-sensitive when this bit is low.
PLTY When this bit is low, interrupt is activated by a falling
edge/low level on the PRACKI* pin.
When this bit is high, interrupt is activated by a rising
edge/high level on the PRACKI* pin.
Note that if this bit is changed while the E/L* bit is set (or
is being set), an ACK interrupt may be generated. This can
be avoided by setting the ICLR bit during write cycles that
change the E/L* bit.
ADR/SIZ $FFF42030 (8 bits)
BIT 31 30 29 28 27 26 25 24
NAME PLTY E/L* INT IEN ICLR IL2 IL1 IL0
OPER R/W R/W R R/W C R/W R/W R/W
RESET 0 PL 0 PL 0 PL 0 PL 0 PL 0 PL 0 PL 0 PL