upd70f3017ay Renesas Electronics Corporation., upd70f3017ay Datasheet - Page 119

• Manufacturer Part Number: upd70f3017ay
• Description: V850/sa1tm 32-/16-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

Interrupt request a
Interrupt request e
Interrupt request g
Interrupt request c
Caution The values of EIPC and EIPSW must be saved before executing multiple interrupts.
Remarks 1. a to u in the figure are the names of interrupt requests shown for the sake of explanation.
(level 3)
(level 3)
(level 2)
(level 1)
2. The default priority in the above figure indicates the relative priority between two interrupt requests.
Main routine
EI
Interrupt request d
Interrupt request f
Interrupt request h
CHAPTER 5 INTERRUPT/EXCEPTION PROCESSING FUNCTION
Figure 5-7. Example of Multiple Interrupt Servicing (1/2)
(level 1)
Interrupt
request b
(level 2)
(level 3)
(level 2)
EI
EI
EI
Servicing of e
Servicing of f
Servicing of a
Servicing of c
Servicing of g
Servicing of d
Servicing of h
User’s Manual U12768EJ4V1UD
Servicing of b
Interrupt request b is acknowledged because the priority of
b is higher than that of a and interrupts are enabled.
Although the priority of interrupt request d is higher
than that of c, d is held pending because interrupts
are disabled.
Interrupt request f is held pending even if interrupts are
enabled because its priority is lower than that of e.
Interrupt request h is held pending even if interrupts are
enabled because its priority is the same as that of g.
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