mcf5407 Freescale Semiconductor, Inc, mcf5407 Datasheet - Page 254
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mcf5407
Manufacturer Part Number
mcf5407
Description
Mcf5407 Coldfire Integrated Microprocessor User
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MCF5407.pdf
(546 pages)
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Interrupt Controller Registers
Table 9-4 shows possible priority schemes for internal and external sources of the
MCF5407. The internal module interrupt source in this table can be any internal interrupt
source programmed to the given level and priority.
This table shows how external interrupts are prioritized with respect to internal interrupt
sources within the same level. For example, UART0 and UART1 sources are programmed
to IL = 110; in this case, UART0 is given lower priority than UART1, so ICR4[IP] = 01 and
the ICR5[IP] = 10. IRQ3 is programmed to level 6. If all three assert an interrupt request at
the same time, they are serviced in the following order:
9-4
Priority
1. ICR5[IL] = 110 and ICR5[IP] = 10, so UART1 is serviced first (priority 7 in
2. External interrupt IRQ3, set to level 6, is serviced next (priority 8).
3. ICR4[IL] = 110 and ICR5[IP] = 01, so UART0 is serviced last (priority 9).
10
11
12
13
14
15
1
2
3
4
5
6
7
8
9
Table 9-4).
Interrupt
Level
Assigning the same interrupt level and priority to multiple
ICRs causes unpredictable system behavior.
7
6
5
111
111
111
111
110
110
110
110
101
101
101
101
xxx
xxx
xxx
IL
ICR
Table 9-4. Interrupt Priority Scheme
11
10
01
00
11
10
01
00
11
10
01
00
IP
xx
xx
xx
Internal module
External interrupt pin IRQ7
Internal module
Internal module
External interrupt pin IRQ3 (programmed as IRQ6)
Internal module
Internal module
External interrupt pin IRQ5
Internal module
MCF5407 User’s Manual
NOTE:
Interrupt Source
IRQPAR[IRQPAR]
xxx
xxx
xxx
xxx
xxx
xxx
xxx
x1x
xxx
xxx
xxx
xxx
0xx
xxx
xxx
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