Fujitsu ALL Series, Application Note

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EXTERNAL INTERRUPTS
Chapter 4 External Interrupt Examples
© Fujitsu Microelectronics Europe GmbH - 9 - MCU-AN -300203-E-V17
4 External Interrupt Examples
EXAMPLES FOR EXTERNAL INTERRUPTS
4.1 Basic Functionality
The following example shows how to set up the External Interrupt Channel 0 of the
MB96340 Series.
Please note, that the corresponding interrupt vector and level has to be defined in the
vectors.c module of our standard template project.
/* THIS SAMPLE CODE IS PROVIDED AS IS AND IS SUBJECT TO ALTERATIONS. FUJITSU */
/* MICROELECTRONICS ACCEPTS NO RESPONSIBILITY OR LIABILITY FOR ANY ERRORS OR */
/* ELIGIBILITY FOR ANY PURPOSES. */
/* (C) Fujitsu Microelectronics Europe GmbH */
/*---------------------------------------------------------------------------*/
void InitIrqLevels( void )
{
. . .
ICR = ((17 & 0xFF) << 8) | 6; // Priority Level 6 for External
// Interrupt 0 of MB96340 Series
}
. . .
__interrupt void IRQHandler_EI0 ( void ); // Prototype
. . .
# pragma intvect IRQHandler_EI0 17 // EXT0 of MB96340 Series
/* THIS SAMPLE CODE IS PROVIDED AS IS AND IS SUBJECT TO ALTERATIONS. FUJITSU */
/* MICROELECTRONICS ACCEPTS NO RESPONSIBILITY OR LIABILITY FOR ANY ERRORS OR */
/* ELIGIBILITY FOR ANY PURPOSES. */
/* (C) Fujitsu Microelectronics Europe GmbH */
/*---------------------------------------------------------------------------*/
void InitExtInt0( void )
{
ADER2 = 0x00; // Port function
PIER07_IE0 = 1; // Enable Port 07_0 input
ELVRL0_LB0 = 0; // LB0, LA0 = 00 -> low level
ELVRL0_LA0 = 0;
EIRR0_ER0 = 0; // reset interrupt request
ENIR0_EN0 = 1; // enable interrupt request
}
. . .
__interrupt void IRQHandler_EI0 ( void )
{
EIRR0_ER0 = 0; // clear interrupt request
. . .
}