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CHAPTER 4 DELAYED INTERRUPT GENERATION MODULE
4.4 Explanation of Operation of Delayed Interrupt Generation
Module
The delayed interrupt generation module has a function for generating or canceling an
interrupt request by software.
■ Explanation of Operation of Delayed Interrupt Generation Module
Using the delayed interrupt generation module requires the setting shown in Figure 4.4-1 .
Figure 4.4-1 Setting for Delayed Interrupt Generation Module
When the R0 bit in the delayed interrupt request generate/cancel register (DIRR) is set to "1" (DIRR: R0 =
1), an interrupt request is generated. There is no interrupt request enable bit.
●
Operation of delayed interrupt generation module
• When the R0 bit in the delayed interrupt request generate/cancel register (DIRR) is set to "1", the
interrupt request latch is set to "1" and an interrupt request is generated to the interrupt controller.
• An interrupt request is generated to the CPU when the interrupt controller prioritizes the interrupt
request over other requests.
• When the interrupt level mask bit of the condition code register (CCR: ILM) is compared to the
interrupt request level (ICR: IL), and the interrupt request level is higher than ILM, CPU executes the
delayed interrupt processing after the instruction currently being executed is completed.
• At interrupt processing, the user program sets the R0 bit to 0 to cancel the interrupt request and performs
task switching.
Figure 4.4-2 shows the operation of the delayed interrupt generation module.
Figure 4.4-2 Operation of Delayed Interrupt Generation Module
− : Undefined bit
❍
: Used bit
bit151413121110 9bit8
DIRR
−−−−−−−R0
❍
DIRR
ICR YY
ICR XX
CMP
IL
ILM
CMP
CPU
Delayed interrupt generation module
Other
request
Interrupt controller
Interrupt
processing