SH-2A datasheet(39/501 Pages) RENESAS

39 / 501 page

Section 3 Exception Handling

Rev. 3.00 Jul 08, 2005 page 25 of 484

REJ09B0051-0300

3.6

Interrupts

3.6.1

Interrupt Sources

Interrupt exception handling can be initiated by an NMI, a user break, the H-UDI, an external

interrupt, or an on-chip peripheral module, as shown in table 3.6.

Table 3.6

Interrupt Sources

Type

Request Source

Number of Sources

NMI

NMI pin (external input)

User break

User break controller

H-UDI

User debug interface

External interrupt (IRQ),

on-chip peripheral module

External interrupt pin, on-chip peripheral

module

See Note

Each interrupt source is assigned a different vector number and vector table offset. For details of

vector numbers and vector table address offsets, see “Interrupt Exception Vectors and Priority” in

the Interrupt Controller section of the hardware manual for the relevant product.

Note: For details and numbers of external interrupts (IRQ) and on-chip peripheral module

request sources, see “Interrupt Sources” in the Interrupt Controller section of the hardware

manual for the relevant product.

3.6.2

Interrupt Priority

Interrupt sources are assigned priority levels. If a number of interrupts occur simultaneously

(multiple interruption), the priority order is determined by the interrupt controller (INTC) and

exception handling is initiated accordingly.

Interrupt source priority levels are expressed as values from 0 to 16, with 0 representing the lowest

priority level and 16 the highest. The NMI interrupt is the highest-priority interrupt at level 16; it

cannot be masked and is always accepted. The user break interrupt and H-UDI are assigned

priority level 15. The priority level of IRQ interrupts and on-chip peripheral module interrupts can

be set as desired in the interrupt priority level setting registers of the INTC (see table 3.7). Priority

levels 0 to 15, but not 16, can be set. For details of the interrupt priority level setting registers, see

the Interrupt Controller section of the hardware manual for the relevant product.

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