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RL78/G1P
CHAPTER 15 INTERRUPT FUNCTIONS
R01UH0895EJ0100 Rev.1.00
588
Nov 29, 2019
Table 15-5. Relationship Between Interrupt Requests Enabled for Multiple Interrupt Servicing
During Interrupt Servicing
Multiple Interrupt Request
Interrupt Being Serviced
Maskable Interrupt Request
Software
Interrupt
Request
Priority Level 0
(PR = 00)
Priority Level 1
(PR = 01)
Priority Level 2
(PR = 10)
Priority Level 3
(PR = 11)
IE = 1
IE = 0
IE = 1
IE = 0
IE = 1
IE = 0
IE = 1
IE = 0
Maskable interrupt
ISP1 = 0
ISP0 = 0
ISP1 = 0
ISP0 = 1
ISP1 = 1
ISP0 = 0
ISP1 = 1
ISP0 = 1
Software interrupt
Remarks 1.
: Multiple interrupt servicing enabled
2.
: Multiple interrupt servicing disabled
3.
ISP0, ISP1, and IE are flags contained in the PSW.
ISP1 = 0, ISP0 = 0: An interrupt of level 1 or level 0 is being serviced.
ISP1 = 0, ISP0 = 1: An interrupt of level 2 is being serviced.
ISP1 = 1, ISP0 = 0: An interrupt of level 3 is being serviced.
ISP1 = 1, ISP0 = 1: Wait for An interrupt acknowledgment (all interrupts enabled).
IE = 0: Interrupt request acknowledgment is disabled.
IE = 1: Interrupt request acknowledgment is enabled.
4.
PR is a flag contained in the PR00L, PR00H, PR01L, PR10L, PR10H, and PR11L registers.
PR = 00: Specify level 0 with
PR1
= 0,
PR0
= 0 (higher priority level)
PR = 01: Specify level 1 with
PR1
= 0,
PR0
= 1
PR = 10: Specify level 2 with
PR1
= 1,
PR0
= 0
PR = 11: Specify level 3 with
PR1
= 1,
PR0
= 1 (lower priority level)