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ST9 USER GUIDE

5.4.3.3.1 Part 2: Interrupt Vector Declaration

/* +------------------------------------------------------------+

| PART 2: INTERRUPT VECTOR DECLARATION

+------------------------------------------------------------+ */

;

Interrupt vector definition

;

Absolute address 0 is assumed (. == 0x0000)

.word __Reset

; address of reset routine

.word DIVIDE_BY_ZERO_TRAP_LABEL

; address of the divide by zero

; trap routine

.org 0x06

.word 0xffff

;no external watchdog used

.rept 126

.word __Default_Interrupt_Handler; default interrupt handler

; routine

.endr

; end of macro definition

The start-up file defines the reset vector and the divide by zero trap vector. All other vectors

are directed to a default interrupt handler.

A new vector must be defined for each interrupt routine of the user program. The vector loca-

tion must match the corresponding IVR register. Example:

.word __Reset

; address of reset routine

.word DIVIDE_BY_ZERO_TRAP_LABEL ; address of the divide by zero

; trap routine

.org 0x06

.word 0xffff

;no external watchdog used

.org 0x56

.word INTSCI_TransmitReady

.org 0x100

ST9 Datasheet(PDF) 126 Page - STMicroelectronics