RL78/G1H CHAPTER 19 INTERRUPT FUNCTIONS
R01UH0575EJ0120 Rev. 1.20 Page 725 of 920
Dec 22, 2016
Remark 1. √: Multiple interrupt servicing enabled
Remark 2. ×: Multiple interrupt servicing disabled
Remark 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.
Remark 4. PR is a flag contained in the PR00L, PR00H, PR01L, PR01H, PR02L, PR02H, PR10L, PR10H, PR11L, PR11H, PR12L,
and PR12H 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)
Table 19 - 8 Relationship Between Interrupt Requests Enabled for Multiple Interrupt Servicing
During Interrupt Servicing
Multiple Interrupt Request 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)
Interrupt Being Serviced 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 √×√×√×√× √
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