Fujitsu Microelectronics Europe
Application Note
MCU-AN-390075-E-V10
F²MC-16LX FAMILY
16-BIT MICROCONTROLLER
MB90XXX
RELOCATED INTERRUPT
VECTOR TABLE
APPLICATION NOTE
Interrupt Jump Table
Revision History
Revision History
Date
2002-10-21
Issue
st
M. Willam; 1 version
This document contains 10 pages.
MCU-AN-390075-E-V10
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© Fujitsu Microelectronics Europe GmbH
Interrupt Jump Table
Warranty and Disclaimer
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© Fujitsu Microelectronics Europe GmbH
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Interrupt Jump Table
Contents
Contents
REVISION HISTORY ............................................................................................................ 2
WARRANTY AND DISCLAIMER ......................................................................................... 3
CONTENTS .......................................................................................................................... 4
0 INTRODUCTION.............................................................................................................. 5
1 THE INTERRUPT TABLE ................................................................................................ 6
1.1
Location .................................................................................................................. 6
1.2
Normal Reference ................................................................................................... 7
2 SECOND TABLE - WORKAROUND ............................................................................... 8
2.1
Relocated Reference............................................................................................... 8
2.2
Interrupt Flow .......................................................................................................... 9
2.3
Code Flow ............................................................................................................. 10
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Interrupt Jump Table
Introduction
0 Introduction
This document describes how to use a customized Interrupt Vector Jump Table.
© Fujitsu Microelectronics Europe GmbH
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Interrupt Jump Table
Chapter 1 The Interrupt Table
1 The Interrupt Table
DESCRIPTION OF THE INTERRUPT VECTOR TABLE
1.1
Location
The interrupt vector table is located fix in the Bank FFH. There is no way for the user to move
it to another memory location.
Below is a list of the interrupt vector address locations:
Vector
Interrupt
Vector
Hardware
Interrupt
Interrupt
Control Reg.
Address L
Address M
Address H
INT0
None
-
FFFFFCH
FFFFFDH
FFFFFEH
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
INT7
None
-
FFFFE0H
FFFFE1H
FFFFE2H
INT8
Reset
-
FFFFDCH
FFFFDDH
FFFFDEH
INT9
INT9 Instruction
-
FFFFD8H
FFFFD9H
FFFFDAH
INT10
Exception
-
FFFFD4H
FFFFD5H
FFFFD6H
INT11
(device specific)
FFFFD0H
FFFFD2H
FFFFD3H
INT12
(device specific)
FFFFCCH
FFFCDH
FFFFCEH
…
…
…
…
…
INT254
(device specific)
FFFC04H
FFFC05H
FFFC06H
INT255
(device specific)
FFFC00H
FFFC01H
FFFC02H
ICR00
…
ICR122
Note, that a device can have theoretical 255 interrupts, but in the most devices the number
of interrupts is less than 45.
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Interrupt Jump Table
Chapter 1 The Interrupt Table
1.2
Normal Reference
An example of he usual interrupt vector reference without relocation is shown below. This
has to be done in the file “vectors.c”.
. . .
/* Prototypes
*/
__interrupt
void
IRQ_Handler1(void);
__interrupt
void
IRQ_Handler2(void);
__interrupt
void
IRQ_Handler3(void);
. . .
/* Vector definition
*/
#pragma intvect IRQ_Handler1 9
#pragma intvect IRQ_Handler2 10
#pragma intvect IRQ_Handler3 11
. . .
usual “vectors.c”
The following illustration shows the corresponding Interrupt handler routines. In this example
they can be found in the main program “main.c”.
. . .
/* End of void main(void)
*/
}
__interrupt void IRQ_Handler1(void)
{
. . .
/* Code here
*/
}
__interrupt void IRQ_Handler2(void)
{
. . .
/* Code here
*/
}
__interrupt void IRQ_Handler3(void)
{
. . .
/* Code here
*/
}
“main.c“
© Fujitsu Microelectronics Europe GmbH
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Interrupt Jump Table
Chapter 2 Second Table - Workaround
2 Second Table - Workaround
USING A SECOND TABLE
2.1
Relocated Reference
It is possible to use a second so-called “Jump-Table”, which is then independent from the
hard-wired table.
This table then has to be like in the following example in a separate assembly file:
.PROGRAM NEWVECT
.TITLE
"ALTERNATIVE IRQ VECTOR TABLE"
.SECTION NEWINTVECT, CONST, LOCATE=H'FF8000 ; depends on MCU type
.IMPORT
_IRQ_Handler1
.IMPORT
_IRQ_Handler2
.IMPORT
_IRQ_Handler3
.EXPORT
_Vector1
.EXPORT
_Vector2
.EXPORT
_Vector3
_Vector1:
JMPP
_IRQ_Handler1
_Vector2:
JMPP
_IRQ_Handler2
_Vector3:
JMPP
_IRQ_Handler3
. . .
. . .
. . .
.END
”newvect.asm”
“_IRQ_Handlern” is the basic interrupt handler function (ISR), which is normally referenced
in “vectors.c” without relocation.
Depending on the Code segment in which this table and the interrupt service routine are
located, you have to be careful using the “JMP” (16-Bit-Addressing) or the “JMPP” (24-BitAddressing) instruction.
Note, that “JMPP” will always work.
The next step is to reference to these Jump-Locations in the “vectors.c” file:
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© Fujitsu Microelectronics Europe GmbH
Interrupt Jump Table
Chapter 2 Second Table - Workaround
. . .
/* Prototypes
*/
__interrupt
void
Vector1(void);
__interrupt
void
Vector2(void);
__interrupt
void
Vector3(void);
. . .
/* Vector definition
*/
#pragma intvect Vector1 9
#pragma intvect Vector2 10
#pragma intvect Vector3 11
. . .
“vectors.c”
The file in which the Interrupt routines are coded (“Main.c”) remains unaffected.
2.2
Interrupt Flow
Now the instruction flow is like in the following illustration.
Interrupt occurs
Save Registers
no
IRQ
11 ?
Check if RESET,
EI2OS, INT9, …
yes
Fetch address of
corresponding vector
Workaround
Vector Table FFxxxxH
st
1 jump
PC: Corresponding
instruction of Interrupt
Vector Jump Table
2
nd
New Vector Jump
Table
jump
Interrupt Service
Routine
Jump to Interrupt
Handler Function (ISR)
© Fujitsu Microelectronics Europe GmbH
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MCU-AN-390075-E-V10
Interrupt Jump Table
Chapter 2 Second Table - Workaround
2.3
Code Flow
The following graphic illustrates the program code flow for the Jump Table Workaround:
“Vectors.c”
“Main.c”
Vectoraddressm-2
Instructionn
Instructionn+1
Instructionn+2
Vectoraddressm-1
IRQm
CPU
Tasks
Instructionn+3
get
Vectoraddressm
Addr.
Vectoraddressm+1
Vectoraddressm+2
Instructionn+4
Instructionn+5
Jump to
Vectoraddr.
Return from
Interrupt
“Newvect.asm”
Vectoraddr m-2
JMP ISRm-2
Vectoraddr m-1
JMP ISRm-1
Vectoraddrm
JMP ISRm
Vectoraddrm+1
JMP ISRm+1
Vectoraddrm+2
JMP ISRm+2
Interrupt Handler Routine
ISRm-Instruction1
Jump to
ISR
ISRm-Instruction2
ISRm-Instruction3
...
ISRm-Instructioni
RETI
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© Fujitsu Microelectronics Europe GmbH