H8S-2350 RENESAS [Renesas Technology Corp], H8S-2350 Datasheet - Page 145
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H8S-2350
Manufacturer Part Number
H8S-2350
Description
16-Bit Single-Chip Microcomputer
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.H8S-2350.pdf
(1025 pages)
- Current page: 145 of 1025
- Download datasheet (6Mb)
5.4.3
Eight-level masking is implemented for IRQ interrupts and on-chip supporting module interrupts
by comparing the interrupt mask level set by bits I2 to I0 of EXR in the CPU with IPR.
Figure 5.6 shows a flowchart of the interrupt acceptance operation in this case.
[1] If an interrupt source occurs when the corresponding interrupt enable bit is set to 1, an
[2] When interrupt requests are sent to the interrupt controller, the interrupt with the highest
[3] Next, the priority of the selected interrupt request is compared with the interrupt mask level set
[4] When an interrupt request is accepted, interrupt exception handling starts after execution of the
[5] The PC, CCR, and EXR are saved to the stack area by interrupt exception handling. The PC
[6] The T bit in EXR is cleared to 0. The interrupt mask level is rewritten with the priority level of
[7] A vector address is generated for the accepted interrupt, and execution of the interrupt
interrupt request is sent to the interrupt controller.
priority according to the interrupt priority levels set in IPR is selected, and lower-priority
interrupt requests are held pending. If a number of interrupt requests with the same priority are
generated at the same time, the interrupt request with the highest priority according to the
priority system shown in table 5.4 is selected.
in EXR. An interrupt request with a priority no higher than the mask level set at that time is
held pending, and only an interrupt request with a priority higher than the interrupt mask level
is accepted.
current instruction has been completed.
saved on the stack shows the address of the first instruction to be executed after returning from
the interrupt handling routine.
the accepted interrupt.
If the accepted interrupt is NMI, the interrupt mask level is set to H'7.
handling routine starts at the address indicated by the contents of that vector address.
Interrupt Control Mode 2
Rev. 3.00 Sep 15, 2006 page 111 of 988
Section 5 Interrupt Controller
REJ09B0330-0300
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