upd70f3017ay Renesas Electronics Corporation., upd70f3017ay Datasheet - Page 132

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

5.6 Priority Control
5.6.1 Priorities of interrupts and exceptions
5.6.2 Multiple interrupts
generated and acknowledged, it will be allowed to stop a current interrupt servicing routine in progress. Execution of
the original routine will resume once the higher priority interrupt routine is completed.
interrupt will be held pending.
servicing routine, the interrupt enabled state (ID = 0) must be set.
or exception, EIPC and EIPSW must be saved.
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Multiple interrupt servicing is a function that allows the nesting of interrupts.
If an interrupt with a lower or equal priority is generated and a service routine is currently in progress, the later
Multiple interrupt servicing control is performed when in the interrupt enabled state (ID = 0). Even in an interrupt
If a maskable interrupts are enabled or an exception is generated during a service program of a maskable interrupt
The following example shows the procedure of interrupt nesting.
RESET: Reset
NMI:
INT:
TRAP: Software exception
ILGOP: Illegal opcode exception
*:
×:
↑:
←:
CHAPTER 5 INTERRUPT/EXCEPTION PROCESSING FUNCTION
RESET
NMI
INT
TRAP
ILGOP
Table 5-3. Priorities of Interrupts and Exceptions
Non-maskable interrupt
Maskable interrupt
The item on the left ignores the item above.
The item on the left is ignored by the item above.
The item above is higher than the item on the left in priority.
The item on the left is higher than the item above in priority.
RESET
×
×
×
×
User’s Manual U12768EJ4V1UD
NMI
↑
↑
↑
*
INT
←
↑
↑
*
TRAP
←
←
↑
*
ILGOP
←
←
←
*
If a higher priority interrupt is