UPD78F0078GK-9ET-A Renesas Electronics America, UPD78F0078GK-9ET-A Datasheet - Page 409

• Manufacturer Part Number: UPD78F0078GK-9ET-A
• Manufacturer: Renesas Electronics America

Specifications of UPD78F0078GK-9ET-A

• Lead Free Status / Rohs Status: Supplier Unconfirmed

19.4 Interrupt Servicing Operations
19.4.1 Non-maskable interrupt request acknowledgment operation
state. It does not undergo interrupt priority control and has the highest priority of all interrupts.
then PC, the IE flag and ISP flag are reset (0), and the contents of the vector table are loaded into the PC and branched.
This disables the acknowledgment of multiple interrupts.
is acknowledged after the current non-maskable interrupt servicing program is terminated (following RETI instruction
execution) and one main routine instruction has been executed. However, if a new non-maskable interrupt request
is generated twice or more during non-maskable interrupt servicing program execution, only one non-maskable
interrupt request is acknowledged after termination of the non-maskable interrupt servicing program.
acknowledgment, the acknowledgment timing of a non-maskable interrupt request, and the acknowledgment
operation when multiple non-maskable interrupt requests are generated, respectively.
A non-maskable interrupt request is unconditionally acknowledged even in an interrupt acknowledgment disabled
If a non-maskable interrupt request is acknowledged, the contents are saved into the stacks in the order of PSW,
A new non-maskable interrupt request generated during execution of a non-maskable interrupt servicing program
Figures 19-7, 19-8, and 19-9 show the flowchart of non-maskable interrupt request generation through
Caution Be sure to use the RETI instruction to restore processing from the non-maskable interrupt.
CHAPTER 19 INTERRUPT FUNCTIONS
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