M16C1N Datasheet, PDF (60/238 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/10 SERIES

M16C/1N Group
10. Interrupt
10.1.4 Interrupts and Interrupt Vector Tables
If an interrupt request is accepted, a program branches to the interrupt routine set in the interrupt
vector table. Set the first address of the interrupt routine in each vector table. Figure 10.2 shows
format for specifying interrupt vector addresses.
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.
MSB
LSB
Vector address + 0
Low address
Vector address + 1
Mid address
Vector address + 2
Vector address + 3
0000
0000
High address
0000
Figure 10.2 Format for specifying interrupt vector addresses
10.1.4.1 Fixed Vector Tables
The fixed vector table is a table in which addresses are fixed. The vector tables are located in an
area extending from FFFDC16 to FFFFF16. One vector table comprises four bytes. Set the first
address of interrupt routine in each vector table. Table 10.1 lists the interrupts assigned to the fixed
vector tables and addresses of vector tables.
Table 10.1 Interrupt and fixed vector address
Interrupt source Vector table addresses
Remarks
Address (L) to address (H)
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 is filled with 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 1) FFFEC16 to FFFEF16 Do not use
Oscillation stop detection/ FFFF016 to FFFF316
Watchdog timer
________
DBC (Note 1)
FFFF416 to FFFF716 Do not use
UART0 reception (Note 1) FFFF816 to FFFFB16 Do not use
Reset
FFFFC16 to FFFFF16
Note 1: Interrupts used for debugging purposes only.
Rev.1.00 Oct 20, 2004 page 48 of 222
REJ09B0007-0100Z