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CHAPTER 17 INTERRUPT FUNCTIONS
Preliminary User’s Manual U13420EJ2V0UM00
17.4.4 Multiple interrupt servicing
Multiple interrupts occur when another interrupt request is acknowledged during execution of an interrupt.
Multiple interrupts do not occur unless the interrupt request acknowledge enable state is selected (IE = 1) (except
non-maskable interrupts). Also, when an interrupt request is received, interrupt requests acknowledge becomes
disabled (IE = 0). Therefore, to enable multiple interrupts, it is necessary to set (1) the IE flag with the EI instruction
during interrupt servicing to enable interrupt acknowledge.
Moreover, even if interrupts are enabled, multiple interrupts may not be enabled, this being subject to interrupt
priority control. Two types of priority control are available: default priority control and programmable priority control.
Programmable priority control is used for multiple interrupts.
In the interrupt enable state, if an interrupt request with a priority equal to or higher than that of the interrupt currently
being serviced is generated, it is acknowledged for multiple interrupt servicing. If an interrupt with a priority lower
than that of the interrupt currently being serviced is generated during interrupt servicing, it is not acknowledged for
multiple interrupt servicing. Interrupt requests that are not enabled because of the interrupt disable state or they have
a lower priority are held pending. When servicing of the current interrupt ends, the pendent interrupt request is
acknowledged following execution of one main processing instruction execution.
Multiple interrupt servicing is not possible during non-maskable interrupt servicing.
Table 17-4 shows interrupt requests enabled for multiple interrupt servicing, and Figure 17-13 shows multiple
interrupt examples.
Table 17-4. Interrupt Request Enabled for Multiple Interrupt during Interrupt Servicing
Multiple Interrupt Request
Maskable Interrupt Request
Non-Maskable Interrupt Request
PR = 0
PR = 1
Interrupt being Serviced
IE = 1
IE = 0
IE = 1
IE = 0
Non-maskable interrupt
×
×
×
×
×
Maskable interrupt
ISP = 0
×
×
×
ISP = 1
×
×
Software interrupt
×
×
Remarks 1.
: Multiple interrupt enable
2.
×
: Multiple interrupt disable
3. ISP and IE are flags contained in PSW.
ISP = 0: An interrupt with higher priority is being serviced.
ISP = 1: No interrupt request has been acknowledged, or an interrupt with a lower priority is being
serviced.
IE = 0: Interrupt request acknowledge is disabled.
IE = 1: Interrupt request acknowledge is enabled.
4. PR is a flag contained in PR0L, PR0H, and PR1L.
PR = 0: Higher priority level
PR = 1: Lower priority level
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