upd78f0103 Renesas Electronics Corporation., upd78f0103 Datasheet - Page 290

• Manufacturer Part Number: upd78f0103
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

290
Interrupt request held pending
Interrupt request held pending
IE:
ISP:
IF:
MK: Interrupt mask flag
PR: Priority specification flag
Interrupt request flag
Flag that controls acknowledgment of maskable interrupt request (1 = Enable, 0 = Disable)
Flag that indicates the priority level of the interrupt currently being serviced (0 = High-priority interrupt
servicing, 1 = No interrupt request acknowledged, or low-priority interrupt servicing)
Interrupt request held pending
Figure 14-7. Interrupt Request Acknowledgment Processing Algorithm
Yes
No
Vectored interrupt servicing
interrupt request among those
simultaneously generated
Any high-priority
with
IE = 1?
CHAPTER 14 INTERRUPT FUNCTIONS
PR = 0?
No
Yes
User’s Manual U15836EJ5V0UD
Yes (High priority)
No
No
those simultaneously generated
Vectored interrupt servicing
interrupt request among
interrupt request among
those simultaneously
Any high-priority
Any high-priority
with
generated?
ISP = 1?
IE = 1?
MK = 0?
PR = 0?
Start
IF = 1?
PR = 0?
Yes (interrupt request generation)
Yes
No (Low priority)
No
No
Yes
Yes
No
No
Interrupt request held pending
Interrupt request held pending
Interrupt request held pending
Interrupt request held pending
Yes
Yes