STOP PROCESSING STATE

RESET

PROCESSOR ENTERS

RESET STATE

INTERRUPT CONTROL CYCLE 1

INTERRUPT CONTROL CYCLE 2

 

FETCH

 

n3

n4

 

 

 

 

 

 

 

 

 

 

 

 

DECODE

n2

STOP

 

 

 

 

 

 

 

 

 

 

 

 

EXECUTE

n1

n2

STOP

 

 

 

 

 

 

 

 

 

 

 

 

STOP CYCLE COUNT

1

 

2

 

3

 

4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CLOCK STOPPED

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IRESET

= INTERRUPT

 

 

 

 

 

 

 

 

 

n = NORMAL INSTRUCTION WORD

 

 

 

 

 

 

nA, nB, nC = INSTRUCTIONS IN RESET ROUTINE

 

 

 

 

 

STOP

= INTERRUPT INSTRUCTION WORD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PROCESSOR LEAVES RESET STATE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

nop

nA

nB

nC

nD

nE

 

 

 

 

 

 

 

 

nop

nop

nA

nB

nC

nD

 

 

 

 

 

 

 

 

nop

nop

nop

nA

nB

nC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 7-19 STOP Instruction Sequence Recovering with RESET

7 - 42

PROCESSING STATES

MOTOROLA

Page 169
Image 169
Motorola 24-Bit Digital Signal Processor, DSP56000 manual Stop Instruction Sequence Recovering with Reset