CHAPTER 7 INTERRUPT/EXCEPTION PROCESSING FUNCTION
User’s Manual U12688EJ4V0UM00
214
Figure 7-7. Example of Processing in Which Another Interrupt Request Is Issued While
Interrupt Is Being Processed (2/2)
Main routine
EI
Interrupt request i
(level 2)
Processing of i
Processing of k
Interrupt
request j
(level 3)
Processing of j
Interrupt request l
(level 2)
EI
EI
EI
EI
Interrupt request o
(level 3)
Interrupt request s
(level 1)
Interrupt request k
(level 1)
Processing of l
Processing of n
Processing of m
Processing of s
Processing of u
Processing of t
Interrupt
request m
(level 3)
Interrupt request n
(level 1)
Processing of o
Interrupt
request p
(level 2)
Interrupt
request q
(level 1)
Interrupt
request r
(level 0)
Interrupt request u
(level 2)
Note 2
Interrupt
request t
(level 2)
Note 1
Processing of p
Processing of q
Processing of r
EI
If levels 3 to 0 are acknowledged
Interrupt request j is held pending because its
priority is lower than that of i. k, which occurs after
j, is acknowledged because it has the higher
priority.
Interrupt requests m and n are held pending
because processing of l is performed in the
interrupt disabled status.
Pending interrupt requests are acknowledged after
processing of interrupt request l.
At this time, interrupt requests n is acknowledged
first even though m has occurred first because the
priority of n is higher than that of m.
Pending interrupt requests t and u are
acknowledged after processing of s.
Because the priorities of t and u are the same, u is
acknowledged first because it has the higher
default priority, regardless of the order in which the
interrupt requests were generated.
Notes 1. Lower default priority
2. Higher default priority
Содержание V850E/MS1 UPD703100
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