Motorola MVME2300 Series User Manual download pdf (Page 151)

Raven Interrupt Controller

http://www.motorola.com/computer/literature 2-81

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

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

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

09876543210

Name EXTERNAL SOURCE VECTOR/PRIORITY

MASK

ACT

POL

SENSE

PRIOR VECTOR

Operation

R/W

R/W R R/W

Reset

$000

$0 $00 $00

1 2 ... 146 147 148 149 150 151 152 153 154 155 156 ... 281 282

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Motorola MVME2300 Series User Manual Page 151