dsp56800e Freescale Semiconductor, Inc, dsp56800e Datasheet - Page 292

• Manufacturer Part Number: dsp56800e
• Description: 16-bit Digital Signal Controller Core
• Manufacturer: Freescale Semiconductor, Inc

Instruction Pipeline
10-12
i = Interrupt Arbitration and Request
ii = Interrupt instruction word
ii0 = First word of JSR instruction
ii1 = Second word of JSR instruction
n = Normal instruction word
Pipeline
Int Arbitr
Int Req
Stage
OP2
EX2
AG
EX
P1
P2
ID
IF
n1 n2 n3 n4 ii0 ii1
1
n1 n2 n3 n4 ii0
2
Figure 10-4. Interrupting an Interrupt Handler (Nested Interrupt)
n1 n2 n3 n4
i1
3
1st ISR — ii10
1st ISR — ii8
1st ISR — ii9
n1 — —
i2
i1
4
Interrupt
Handler
Sampled by the Arbiter
First Interrupt Request
n1 —
i2
5
n1
6
DSP56800E Core Reference Manual
ii1
ii1
ii0
—
—
—
n1
7
n1
ii1
ii1
ii1
jsr
—
—
—
8
(b) Interrupt Pipeline
(a) Instruction Flow
jsr
jsr
(RTI or RTID)
ii2
ii1
ii1
—
—
—
9
Return From
Jump Address (LBL)
Interrupt
Explicit
10 11
ii3
ii1
jsr
jsr
jsr
—
—
ii2
Vector Table
Interrupt
Instruction Cycle
JSR
i2a
ii4
ii3
ii2
jsr
jsr
jsr
jsr
—
12 13 14
i2a
ii5
ii4
ii3
ii2
jsr
jsr
jsr
—
jsr
jsr
ii0
ii5
ii4
—
ii2
—
ii1
ii5
—
—
ii2
jsr
—
ii0
15 16 17
ii1
ii1
ii0
—
—
—
ii2
—
Interrupt Requests Again
Sampled by the Arbiter
2nd ISR — RTI
2nd ISR — ii2
2nd ISR — ii3
2nd ISR — ii4
2nd ISR — iin
Subroutine
ii1
ii1
ii1
jsr
—
—
—
ii2
Interrupt
Interrupt
Routine
jsr
jsr
ii2
ii1
ii1
—
—
—
Freescale Semiconductor
18 19 20
ii3
ii2
ii1
jsr
jsr
jsr
—
—
ii4
ii3
ii2
jsr
jsr
jsr
jsr
—
PC Resumes
Operation
jsr
jsr
jsr
ii5
ii4
ii3
ii2
—
21 22
jsr
jsr
ii6
ii5
ii4
ii3
ii2
—
ii7
ii6
ii5
ii4
ii3
ii2
jsr
—