HD64F2149YV datasheet(119/1075 Pages) RENESAS

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Section 4 Exception Handling

Rev. 3.00 Jan 18, 2006 page 91 of 1044

REJ09B0280-0300

Section 4 Exception Handling

4.1

Overview

4.1.1

Exception Handling Types and Priority

As table 4.1 indicates, exception handling may be caused by a reset, trap instruction, or interrupt.

Exception handling is prioritized as shown in table 4.1. If two or more exceptions occur

simultaneously, they are accepted and processed in order of priority. Trap instruction exceptions

are accepted at all times in the program execution state.

Exception handling sources, the stack structure, and the operation of the CPU vary depending on

the interrupt control mode set by the INTM0 and INTM1 bits in SYSCR.

Table 4.1

Exception Types and Priority

Priority

Exception Type

Start of Exception Handling

High

Reset

Starts immediately after a low-to-high transition at the

RES pin, or when the watchdog timer overflows.

Trace*

Starts when execution of the current instruction or

exception handling ends, if the trace (T) bit is set to 1.

Interrupt

Starts when execution of the current instruction or

exception handling ends, if an interrupt request has been

issued.*

Direct transition

Started by a direct transition resulting from execution of a

SLEEP instruction.

Low

Trap instruction (TRAPA)*

Started by execution of a trap instruction (TRAPA).

Notes: 1. Traces are enabled only in interrupt control modes 2 and 3. (They cannot be used in the

H8S/2169 or H8S/2149.) Trace exception handling is not executed after execution of an

RTE instruction.

2. Interrupt detection is not performed on completion of ANDC, ORC, XORC, or LDC

instruction execution, or on completion of reset exception handling.

3. Trap instruction exception handling requests are accepted at all times in the program

execution state.

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