Fujitsu FR81S User Manual
CHAPTER 15: DELAY INTERRUPT
5. Operation
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER
: DELAY INTERRUPT
FUJITSU SEMICONDUCTOR CONFIDENTIAL
7
5. Operation
This section explains the operation description of the delay interrupt.
The delay interrupts are used to generate interrupts for task switching. Using this function allows interrupt
requests to the CPU to be generated and cancelled by software.
Interrupt Vector Number
The delay interrupts are allocated to the interrupt sources with the highest interrupt vector number.
In this core, delay interrupts are allocated to interrupt vector number 63 (0x3F).
DLYI Bit of the DICR Register
Writing "1" to this bit generates a delay interrupt source. Writing "0" to this bit cancels the delay interrupt
source.
This bit functions like a standard interrupt source flag and should be cleared in the interrupt routine at the
same time as when switching a task.
MB91520 Series
MN705-00010-1v0-E
502