UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 566

• Manufacturer Part Number: UPD784026
• Description: 16/8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

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Remark “a” to “f” in the figure are arbitrary names used to differentiate between the interrupt requests and macro service
Macro Service Request b (Level 3)
Macro Service Request c (Level 1)
Macro Service Request f (Level 1)
Interrupt Request a (Level 2)
Interrupt Request d (Level 1)
Interrupt Request e (Level 1)
requests.
Default Priority Order
a > b > c > d > e > f
Figure 20-14 Examples of Processing of Simultaneously Generated Interrupts
Main Routine
EI
CHAPTER 20 INTERRUPT FUNCTIONS
Macro Service Request b Processing
Macro Service Request c Processing
Macro Service Request f Processing
Interrupt Request d Processing
Interrupt Request e Processing
Interrupt Request a Processing
• When requests are generated
• Macro service requests are
• As interrupt requests are
• As d and e have the same
simultaneously, they are
acknowledged in order starting
with macro service.
acknowledged in default priority
order (b/c/f) (not dependent
upon the programmable priority
order).
acknowledged in high-to-low
priority level order, d and e are
acknowledged first.
prority level, the interrupt
request with the higher default
priority, d, is acknowledged
first.