32186 datasheet(133/1032 Pages) RENESAS

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INTERRUPT CONTROLLER (ICU)

5-9

32185/32186 Group Hardware Manual

Rev.1.10 REJ09B0235-0110 May 15, 07

5.2 ICU Related Registers

1011121314

b15)

(b8

123456

ILEVEL

IREQ

111

Bit Name

Function

0–2

No function assigned. Fix to "0"

(8–10)

IREQ

(11)

Interrupt request bit

At read

0: Interrupt not requested

1: Interrupt requested

At write

0: Clear interrupt request

1: Generate interrupt request

At read

0: Interrupt not requested

1: Interrupt requested

No function assigned. Fix to "0"

(12)

5–7

ILEVEL

000: Interrupt priority level 0

(13–15)

Interrupt priority level bits

001: Interrupt priority level 1

010: Interrupt priority level 2

011: Interrupt priority level 3

100: Interrupt priority level 4

101: Interrupt priority level 5

110: Interrupt priority level 6

111: Interrupt priority level 7 (interrupt disabled)

(1) IREQ (Interrupt Request) bit (Bit 3 or 11)

When an interrupt request from some internal peripheral I/O occurs, the corresponding IREQ (Inter-

rupt Request) bit is set to "1."

This bit can be set and cleared in software for only edge-recognized interrupt request sources (and

not for level-recognized interrupt request sources). Also, when this bit is set by an edge-recognized

interrupt request generated, it is automatically cleared to "0" by reading the Interrupt Vector Register

(IVECT) (not cleared in the case of level-recognized interrupt request).

If the IREQ bit is cleared in software at the same time it is set by an interrupt request generated,

clearing in software has priority. Also, if the IREQ bit is cleared by reading the Interrupt Vector Regis-

ter (IVECT) at the same time it is set by an interrupt request generated, clearing by a read of the

IVECT register has priority.

Note: • External Interrupt (EI) to the CPU core is not deasserted by clearing the IREQ bit. External

Interrupt (EI) to the CPU core can only be deasserted by the following operation:

(1) Reset

(2) IVECT register read

(3) Write to the IMASK register

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