M16CSLASH26 datasheet(53/239 Pages) RENESAS

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Interrupts

Renesas Technology Corp.

M16C/26 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Under

development

Preliminary Specifications Rev. 0.9

Specifications in this manual are tentative and subject to change.

Figure 1.9.2. Format for specifying interrupt vector addresses

Vector address + 0

Vector address + 1

Vector address + 2

Vector address + 3

LSB

MSB

Interrupts and Interrupt Vector Tables

If an interrupt request is accepted, a program branches to the interrupt routine set in the interrupt vector

table. The first address of the interrupt routine is stored in the corresponding vector. Figure 1.9.2 shows

the format for specifying the address.

Two types of interrupt vector tables are available — fixed vector table in which addresses are fixed and

variable vector table in which addresses can be varied by the setting.

• Fixed vector table

The fixed vector table is a table in which addresses are fixed. The vector tables are located in an

address range extending from FFFDC16 to FFFFF16. A vector consists of four bytes. Set the first

address of interrupt routine in the corresponding vector. Table 1.9.1 shows the interrupts assigned to

the fixed vector table and the vector addresses.

Table 1.9.1. Interrupts assigned to the fixed vector tables and addresses of vector tables

Interrupt source

Vector table addresses

Address (L) to address (H)

Remarks

Undefined instruction

FFFDC16 to FFFDF16

Interrupt on UND instruction

Overflow

FFFE016 to FFFE316

Interrupt on INTO instruction

BRK instruction

FFFE416 to FFFE716

If the vector contains FF16, program execution starts from

the address shown by the vector in the variable vector table.

Address match

FFFE816 to FFFEB16

There is an address-matching interrupt enable bit.

Single step (Note)

FFFEC16 to FFFEF16

Do not use.

Watchdog timer,

FFFF016 to FFFF316

Oscillation stop and

re-oscillation detection,

VDET4 detection

DBC (Note)

FFFF416 to FFFF716

Do not use.

NMI

FFFF816 to FFFFB16

External interrupt by input to NMI pin.

Reset

FFFFC16 to FFFFF16

Note: Interrupts used for debugging purposes only.

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