HD6417034B RENESAS [Renesas Technology Corp], HD6417034B Datasheet - Page 86
HD6417034B
Manufacturer Part Number
HD6417034B
Description
32-Bit RISC Microcomputer
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417034B.pdf
(687 pages)
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Section 4 Exception Handling
Table 4.7
Type
NMI
User break
IRQ and on-chip supporting
modules
4.4.3
When an interrupt is generated, the INTC ascertains the interrupt ranking. NMI is always
accepted, but other interrupts are only accepted if their ranking is higher than the ranking set in the
interrupt mask bits (I3–I0) of SR.
When an interrupt is accepted, interrupt exception handling begins. In the interrupt exception
handling sequence, the SR and PC values are pushed onto the stack, and the priority level of the
accepted interrupt is copied to the interrupt mask level bits (I3–I0) in SR. In NMI exception
handling, the priority ranking is 16 but the value 15 (H'F) is stored in I3–I0. The exception
handling routine start address for the accepted interrupt is fetched from the exception vector table
and the program branches to that address and starts executing. For further information on
interrupts, see section 5.4, Interrupt Operation.
Rev. 7.00 Jan 31, 2006 page 60 of 658
REJ09BX0272-0700
Interrupt Exception Handling
Interrupt Priority Rankings
Priority
16
15
0–15
Fixed and unmaskable
Set in interrupt priority level registers A–E
(IPRA–IPRE)
Comments
Fixed
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