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MOD-Mode
0 =Normal operational mode. Interrupt request lines are configured as
IPL2-IPLO.
1 =Dedicated operational mode. Interrupt request lines are configured
as IRQ7, IR06, and IRQ1.
IV7 -
Level 7 Interrupt Vector
This bit is valid in both normal and dedicated modes.
0 =Internal vector. The interrupt controller will provide the vector number
for a level 7 interrupt during interrupt acknowledge cycle.
1 =External vector. The interrupt controller will not provide the vector
number for a level 7 interrupt.
IV6 -
Level 6 Interrupt Vector
This bit is valid in both normal and dedicated modes.
0 =Internal vector. The interrupt controller will provide the vector number
for a level 6 interrupt during the interrupt acknowledge cycle.
1 =External vector. The interrupt controller will not provide the vector
number for a level 6 interrupt.
IV1 -
Level 1 Interrupt Vector
This bit is valid in both normal and dedicated modes.
0 =Internal vector. The interrupt controller will provide the vector number
for a level 1 interrupt acknowledge cycle.
1 =External vector. The interrupt controller will not provide the vector
number for a level 1 interrupt.
ET7 -
IRQ7 Edge-/Level-Triggered
This bit is valid only in the dedicated mode.
0 =Level-triggered. An interrupt is generated when IRQ7 is low.
NOTE
During the M68000 core interrupt acknowledge cycle, if IRQ7 is high,
the interrupt controller will not provide the
vector
number (and
DTACK) regardless of the IV7 bit.
1 =Edge-triggered. An interrupt is generated when IRQ7 changes from
one to zero (falling edge).
ET6 -
IRQ6 Edge-/Level-Triggered
This bit is valid only in the dedicated mode.
0= Level-triggered. An interrupt is generated when IRQ6 is low.
MOTOROLA
MC68302 USER'S MANUAL
3-25
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