upd70f3402 Renesas Electronics Corporation., upd70f3402 Datasheet - Page 700

• Manufacturer Part Number: upd70f3402
• Description: 32-/16-bit Single-chip Microcontroller With Can Interface
• Manufacturer: Renesas Electronics Corporation.

Caution:
Remarks: 1. a to c in the figure are the temporary names of interrupt requests shown for the sake of
700
Default priority
a > b > c
Interrupt request a (level 2)
Interrupt request b (level 1)
Interrupt request c (level 1)
Figure 17-9: Example of Servicing Interrupt Requests Simultaneously Generated
To perform multiple interrupt servicing, the values of the EIPC and EIPSW registers
must be saved before executing the EI instruction. When returning from multiple
interrupt servicing, restore the values of EIPC and EIPSW after executing the DI
instruction.
2. The default priority in the figure indicates the relative priority between two interrupt
explanation.
requests.
Main routine
Chapter 17 Interrupt/Exception Processing Function
EI
User’s Manual U16702EE3V2UD00
Servicing of interrupt request b
Servicing of interrupt request c
Servicing of interrupt request a
.
.
Interrupt request b and c are
acknowledged first according to
their priorities.
Because the priorities of b and c are
the same, b is acknowledged first
according to the default priority.