SH7261 datasheet(172/1348 Pages) RENESAS

172 / 1348 page

Section 6 Interrupt Controller (INTC)

Rev. 2.00 Sep. 07, 2007 Page 140 of 1312

REJ09B0320-0200

As every source is assigned a different interrupt vector, the source does not need to be identified in

the exception service routine. A priority level in a range from 0 to 15 can be set for each module

by interrupt priority registers 05 to 16 (IPR05 to IPR16). The on-chip peripheral module interrupt

exception handling sets the I3 to I0 bits in SR to the priority level of the accepted on-chip

peripheral module interrupt.

6.5

Interrupt Exception Handling Vector Table and Priority

Table 6.4 lists interrupt sources and their vector numbers, vector table address offsets, and

interrupt priorities.

Each interrupt source is allocated a different vector number and vector table address offset. Vector

table addresses are calculated from the vector numbers and vector table address offsets. In

interrupt exception handling, the exception service routine start address is fetched from the vector

table indicated by the vector table address. For details of calculation of the vector table address,

see table 5.4, Calculating Exception Handling Vector Table Addresses, in section 5, Exception

Handling.

The priorities of IRQ interrupts, PINT interrupts, and on-chip peripheral module interrupts can be

set freely between 0 and 15 for each pin or module by setting interrupt priority registers 01, 02,

and 05 to 16 (IPR01, IPR02, and IPR05 to IPR16). However, if two or more interrupts specified

by the same IPR among IPR05 to IPR16 occur, the priorities are defined as shown in the IPR

setting unit internal priority of table 6.4, and the priorities cannot be changed. A power-on reset

assigns priority level 0 to IRQ interrupts, PINT interrupts, and on-chip peripheral module

interrupts. If the same priority level is assigned to two or more interrupt sources and interrupts

from those sources occur simultaneously, they are processed by the default priorities indicated in

table 6.4.

SH7261 Datasheet(PDF) 172 Page - Renesas Technology Corp