32182 datasheet(133/755 Pages) RENESAS

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5-16

INTERRUPT CONTROLLER (ICU)

32182 Group User’s Manual (Rev.1.0)

5.5 Description of Interrupt Operation

[10] Restoring the Interrupt Request Mask Register (IMASK)

Restore the Interrupt Request Mask Register that was saved to the stack in [2].

[11] Restoring registers from the stack

Restore the registers that were saved to the stack in [1].

[12] Completion of external interrupt processing

Execute the RTE instruction to complete the external interrupt processing. The program returns to the

state in which it was before the currently processed interrupt request was accepted.

(3) Identifying the source of the interrupt request generated

If any internal peripheral I/O has two or more interrupt request sources, check the Interrupt Request Status

(4) Enabling multiple interrupts

To enable multiple interrupts in the interrupt handler, set the PSW register IE (Interrupt Enable) bit to enable

interrupt requests to be accepted. However, before writing "1" to the IE bit, be sure to save each register

(BPC, PSW, general-purpose registers and IMASK) to the stack.

Note: • Before enabling multiple interrupts, read the Interrupt Vector Register (IVECT) and then the ICU

vector table, as shown in Figure 5.5.2, “Typical Handler Operation for Interrupts from Internal

Peripheral I/O.”

32182 Datasheet(PDF) 133 Page - Renesas Technology Corp