MMC2107 - Freescale Semiconductor

Interrupt Controller Module
Freescale Semiconductor, Inc.
If the AE bit is 0, then each interrupt request is presented with a vector
number. The low five bits of the vector number (4–0) are determined
based on the highest pending priority, with active fast interrupts having
priority over active normal interrupts. The remaining two bits (vector bits
5 and 6) are determined based on whether the interrupt request is a fast
interrupt and the setting of the FVE bit. If FVE is set, then a fast interrupt
request has a vector number different from that of a normal interrupt
request as shown in Table 7-4.
Table 7-4. Fast Interrupt Vector Number
nc...
Freescale Semiconductor, I
Fast Interrupt
FVE
Interrupt Vector
Bits 6:5
No X 01
X 0 01
Yes 1 10
If FVE is 0, both normal and fast interrupts requests assigned to priority
levels 0–31 are mapped to vector numbers 32–63 in the vector table. If
FVE is 1, normal interrupt requests assigned to priority levels 0–31 are
mapped to vector numbers 32–63 in the vector table.
If FVE is 1, then fast interrupt requests assigned to priority levels 0–31
are mapped to vector numbers 64–95 in the vector table. See Table 7-5.
Vector
Number
Table 7-5. Vector Table Mapping
Usage
Interrupt Vector
Bits 6:5
0–31 Fixed exceptions (including autovectors) 00
32–63
Vectored interrupts
32 = lowest priority
63 = highest priority
64–95
Vectored interrupts
64 = lowest priority
10
95 = highest priority
96–127 Vectored interrupts (not used) 11
01
Technical Data MMC2107 – Rev. 2.0
170 Interrupt Controller Module MOTOROLA
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