dsp56000 Freescale Semiconductor, Inc, dsp56000 Datasheet - Page 155

• Manufacturer Part Number: dsp56000
• Description: 24-bit Digital Signal Processor Family Manual
• Manufacturer: Freescale Semiconductor, Inc

MOTOROLA
i
ii
n = NORMAL INSTRUCTION WORD
INTERRUPT CONTROL CYCLE 1
INTERRUPT CONTROL CYCLE 2
FETCH
DECODE
EXECUTE
INSTRUCTION CYCLE COUNT
= INTERRUPT
= INTERRUPT INSTRUCTION WORD
PROGRAM
MAIN
n1
n2
EXCEPTION PROCESSING STATE (INTERRUPT PROCESSING)
Figure 7-11 JSR First Instruction of a Fast Interrupt
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(a) Instruction Fetches from Memory
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(b) Program Controller Pipeline
1
i
n1
PROCESSING STATES
2
i
INTERRUPT SYNCHRONIZED AND
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RECOGNIZED AS PENDING
JSR
n1
3
FAST INTERRUPT
JSR
n1
—
4
NOT USED
VECTOR
JSR
NOP
JSR
ii2
5
NOP
ii3
ii2
6
ii4
ii3
ii2
7
INTERRUPTS RE-ENABLED
iin
ii4
ii3
8
RTI
iin
ii4
9
RTI
10
—
iin
LONG INTERRUPT
NOP
n2
RTI
11
SUBROUTINE
RTI
ii2
ii3
ii4
iin
NOP
n2
12
13
n2
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