Renesas RL78/G10 - Page 529

RL78/G10 CHAPTER 14 INTERRUPT FUNCTIONS
R01UH0384EJ0311 Rev. 3.11 512
Dec 22, 2016
Table 14-6. 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 (enable all interrupts).
IE = 0: Interrupt request acknowledgment is disabled.
IE = 1: Interrupt request acknowledgment is enabled.
4. PR is a flag contained in the PR00L, PR00H, PR10L, PR10H, PR01L, 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)