R8C2K datasheet(117/471 Pages) RENESAS

117 / 471 page

R8C/2K Group, R8C/2L Group

12. Interrupts

Rev.1.10

Dec 21, 2007

Page 100 of 450

REJ09B0406-0110

12.1.5

Interrupts and Interrupt Vectors

There are 4 bytes in each vector. Set the starting address of an interrupt routine in each interrupt vector. When

an interrupt request is acknowledged, the CPU branches to the address set in the corresponding interrupt vector.

Figure 12.2 shows an Interrupt Vector.

Figure 12.2

Interrupt Vector

12.1.5.1

Fixed Vector Tables

The fixed vector tables are allocated addresses 0FFDCh to 0FFFFh.

Table 12.1 lists the Fixed Vector Tables. The vector addresses (H) of fixed vectors are used by the ID code

check function. For details, refer to 20.3 Functions to Prevent Rewriting of Flash Memory.

NOTE:

1. Do not use these interrupts. They are for use by development tools only.

Table 12.1

Fixed Vector Tables

Interrupt Source

Vector Addresses

Address (L) to (H)

Remarks

Reference

Undefined instruction

0FFDCh to 0FFDFh Interrupt on UND

instruction

R8C/Tiny Series Software

Manual

Overflow

0FFE0h to 0FFE3h

Interrupt on INTO

instruction

BRK instruction

0FFE4h to 0FFE7h

If the content of address

0FFE7h is FFh,

program execution

starts from the address

shown by the vector in

the relocatable vector

table.

Address match

0FFE8h to 0FFEBh

12.4 Address Match

Interrupt

Single step(1)

0FFECh to 0FFEFh

Watchdog timer,

Oscillation stop detection,

Voltage monitor 1,

Voltage monitor 2

0FFF0h to 0FFF3h

15. Watchdog Timer

10. Clock Generation Circuit

6. Voltage Detection Circuit

Address break(1)

0FFF4h to 0FFF7h

(Reserved)

0FFF8h to 0FFFBh

Reset

0FFFCh to 0FFFFh

5. Resets

Vector address (L)

Vector address (H)

MSB

LSB

Low address

Mid address

High address

0 0 0 0

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