H8S2245 datasheet(172/818 Pages) RENESAS

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Section 5 Interrupt Controller

Rev.3.00 Mar. 26, 2007 Page 130 of 772

REJ09B0355-0300

(2) Determination of Priority

The DTC activation source is selected in accordance with the default priority order, and is not

affected by mask or priority levels. See section 7.3.3, DTC Vector Table, for the respective

priorities.

(3) Operation Order

If the same interrupt is selected as a DTC activation source and a CPU interrupt source, the DTC

data transfer is performed first, followed by CPU interrupt exception handling.

Table 5.10 summarizes interrupt source selection and interrupt source clearance control according

to the settings of the DTCE bit of DTCEA to DTCEF in the DTC and the DISEL bit of MRB in

the DTC.

Table 5.10

Interrupt Source Selection and Clearing Control

Settings

DTC

Interrupt Source Selection/Clearing Control

DTCE

DISEL

DTC

CPU

Legend:

: The relevant interrupt is used. Interrupt source clearing is performed.

(The CPU should clear the source flag in the interrupt handling routine.)

: The relevant interrupt is used. The interrupt source is not cleared.

X : The relevant bit cannot be used.

* : Don't care

(4) Usage Note

SCI and A/D converter interrupt sources are cleared when the appropriate DTC register is read or

written to, and are independent of the DISEL bit.

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