Motorola MVME172 - Manual (Page 219)

Programming Model
http://www.mcg.mot.com/literature 3-31
3
82596CA LANC Interrupt Control Register
IL2-IL0 Interrupt Request Level. These three bits select the
interrupt level for the 82596CA LANC. 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 Interrupt Enable. When this bit is set high, the interrupt is
enabled. The interrupt is disabled when this bit is low.
INT This status bit reflects the state of the INT pin from the
LANC (qualified by the IEN bit). When this bit is high, a
LANC INT interrupt is being generated at the level
programmed in
IL2-IL0.
E/L* Edge or Level. When this bit is high, the interrupt is edge-
sensitive. The interrupt is level-sensitive when this bit is
low.
PLTY Polarity. When this bit is low, interrupt is activated by a
rising edge/high level of the LANC INT pin. When this bit
is high, interrupt is activated by a falling edge/low level of
the LANC INT pin. Note that if this bit is changed while
the E/L* bit is set (or is being set), a LANC interrupt may
be generated. This can be avoided by setting the ICLR bit
during write cycles that change the E/L* bit.
ADR/SIZ $FFF42028 (8 bits)
BIT 15 14 13 12 11 10 9 8
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 0 PL 0 PL 0 PL