Motorola MVME2300 Series - Manual (Page 151)

Raven Interrupt Controller
http://www.motorola.com/computer/literature 2-81
2
External Source Vector/Priority Registers
MASK Mask. Setting this bit disables any further interrupts from
this source. If the mask bit is cleared while the bit
associated with this interrupt is set in the IPR, the interrupt
request will be generated.
ACT Activity. The activity bit indicates that an interrupt has
been requested or that it is in-service. The ACT bit is set
to a 1 when its associated bit in the Interrupt Pending
register or In-Service register is set.
POL Polarity. This bit sets the polarity for external interrupts.
Setting this bit to a 0 enables active low or negative edge.
Setting this bit to a 1 enables active high or positive edge.
Only External Interrupt Source 0 uses this bit in this
register.
SENSE Sense. This bit sets the sense for external interrupts.
Setting this bit to a zero enables edge-sensitive interrupts.
Setting this bit to a one enables level-sensitive interrupts.
For external interrupt sources 1 through 15, setting this bit
to a 0 enables positive edge-triggered interrupts. Setting
this bit to a one enables active-low level-triggered
interrupts.
Offset Int Src 0 - $10000
Int Src 2 -> Int Src15 - $10020 -> $101E0
Bit 3
1 3
0 2
9 2
8 2
7 2
6 2
5 2
4 2
3 2
2 2
1 2
0 1
9 1
8 1
7 1
6 1
5 1
4 1
3 1
2 1
1 1
0 9 8 7 6 5 4 3 2 1 0
Name EXTERNAL SOURCE VECTOR/PRIORITY
MA
S
K
ACT PO
L SE
N
S
E
PRIOR VECTOR
Operation
R/W R
R
R/W R/W R R
R/W R R/W
Reset
1 0
$000
0 0 0 0
$0 $00 $00