UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 556

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

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(c) When a watchdog timer interrupt request is generated during NMI service program execution (when the
(d) When an NMI request is generated twice during NMI service program execution
NMI interrupt priority is higher (when PRC in the WDM = 0))
Figure 20-9 Non-Maskable Interrupt Request Acknowledgment Operations (2/2)
NMI Request
NMI Request
Main Routine
Main Routine
CHAPTER 20 INTERRUPT FUNCTIONS
Watchdog
Interrupt
Request
Timer
Request
NMI
Request
NMI
Watchdog timer interrupt is kept
pending because PRC = 0
Pending watchdog timer interrupt is processed
Held pending since NMI service
program is being executed
Held pending since NMI service
program is being executed
NMI request was generated more than
once, but is only acknowledged once