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EXTERNAL INTERRUPTS

Chapter 1 Introduction

© Fujitsu Microelectronics Europe GmbH

- 5 -

MCU-AN -300203-E-V17

1 Introduction

This application note describes the functionality of the External Interrupts and gives some
examples.

1.1 Key

Features

The external interrupts have the following features:

•

Edge sensitivity - rising and falling selectable

•

Level sensitivity - low and high selectable

•

ISR execution is started in 200 ns + minimum 10 CPU cycles after first rising / falling
edge at external interrupt pin

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Содержание ALL Series

Страница 1: ...Fujitsu Microelectronics Europe Application Note MCU AN 300203 E V17 F MC 16FX FAMILY 16 BIT MICROCONTROLLER ALL SERIES EXTERNAL INTERRUPTS APPLICATION NOTE ...

Страница 2: ...7 02 21 V1 2 Updated with re review findings from PHu MPi 2007 03 01 V1 3 Updated with re review findings from HWe MPi 2007 06 05 V1 4 Updated with re review findings from PHu MPi 2007 08 23 V1 5 Fixed typos added flowchart and modified code for disturbed signal MPi 2007 08 28 V1 6 Updated key features and added external interrupt timing MPi 2008 06 24 V1 7 add information on Port Input Enable PHu...

Страница 3: ...y the customer 2 Should a Product turn out to be defect Fujitsu Microelectronics Europe GmbH s entire liability and the customer s exclusive remedy shall be at Fujitsu Microelectronics Europe GmbH s sole discretion either return of the purchase price and the license fee or replacement of the Product or parts thereof if the Product is returned to Fujitsu Microelectronics Europe GmbH in original pac...

Страница 4: ...terrupt Enable Register ENIR 7 2 3 2 External Interrupt Request Register EIRR 7 2 3 3 Request Level Setting Register ELVR 7 2 3 4 Port Input Enable Register 7 3 EXTERNAL INTERRUPT TIMING 8 4 EXTERNAL INTERRUPT EXAMPLES 9 4 1 Basic Functionality 9 4 2 Disturbed Signals 10 4 2 1 Sequence Diagram 11 4 2 2 External Interrupts and DMA 14 4 3 External Interrupts and Wake Up from Stop Mode 14 4 3 1 Examp...

Страница 5: ...ibes the functionality of the External Interrupts and gives some examples 1 1 Key Features The external interrupts have the following features Edge sensitivity rising and falling selectable Level sensitivity low and high selectable ISR execution is started in 200 ns minimum 10 CPU cycles after first rising falling edge at external interrupt pin ...

Страница 6: ...terfaced to the external circuitry The pull up resistor R is connected to limit the current when the key is pressed The capacitor hardware debounce circuit shown with the dotted line is optional and is used to eliminate the bouncing of the switch The RC time constant needs to be chosen according to the bouncing time or debounce delay of the switch If such arrangement is not used then the bouncing ...

Страница 7: ... the corresponding Interrupt Enable bit is disabled 2 3 3 Request Level Setting Register ELVR This register contains a pair of control bits LBx LAx for each channel for the detection kind The following table shows the possible settings LBx LAx Functionality 0 0 L Level Input 0 1 H Level Input 1 0 Rising Edge Pin Input 1 1 Falling Edge Pin Input Table 2 1 ELVR Where x 0 to 7 for ELVR0 and 8 to 15 f...

Страница 8: ...nitely more than all other instructions For further details please refer section 2 4 2 of Interrupts application note MCU AN 300210 Time required for the context saving is dependent on various factors Those are described in section 2 4 1 of Interrupts application note MCU AN 300210 The above mentioned time of 10 cycles is the minimum timing required for context saving External interrupt ISR execut...

Страница 9: ...NY 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 ...

Страница 10: ... at External Interrupt input pin INT0 the interrupt service routine IRQHandler_EI0 will be executed and since the initial value of FLAG variable is TRUE the Reload Timer RLT0 will be started A in the above figure and no further processing would happen After 0 26 seconds debouncing time this can be chosen depending upon the type of key switch the interrupt service routine IRQHandle_RLT0 will be exe...

Страница 11: ...ag remains set Consecutive rising edges at INT0 debounce of key Return Return RLT0 key debounce timer started Trigger RLT0 and enable RLT0 interrupt Clear El0 interrupt flag and disable EI0 interrupt EI0 interrupt flag cleared EI0 interrupts disabled IRQHandler_EI0 First rising edge at INT0 Key press Waiting for External interrupt External Interrupt channel 0 is initialized for rising edge interru...

Страница 12: ...st ENIR0_EN0 1 enable interrupt request void InitRLT0 void TMRLR0 0xFFFF Reload value about 0 26 s 16 MHz TMCSR0 0x0800 Prescaler 1 64 void main void InitRLT0 initialize RLT0 InitExtInt0 initialize EXT0 while 1 __interrupt void IRQHandler_EI0 void EIRR0_ER0 0 clear interrupt request if FLAG TRUE ENIR0_EN0 0 disable interrupt request Figure 3 1 A TMCSR0_UF 0 clear Reload Timer 0 TMCSR0_TRG 1 trigge...

Страница 13: ...E 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 ICR 51 0xFF 8 5 Priority Level 5 for Reload Timer 0 of MB96340 Series __interrupt void IRQHandler_EI...

Страница 14: ...hout noise would appear at the external interrupt pin 4 3 External Interrupts and Wake Up from Stop Mode 4 3 1 Example I The following example shows that External Interrupts can be used to request a stop mode and can wake up the MCU from this mode External Interrupt 0 is used to wake up the MCU and External Interrupt 1 is used to request a stop mode Before stop mode 0x0F is written to Port00 durin...

Страница 15: ... STOPREQUEST stop mode request PDR00 0x0F SMCR 0x03 goto stop mode preserve pin state else run mode for i 0 i 50000 i wait loop __asm NOP __asm NOP PDR00 show that MCU is running ISR external Int 0 __interrupt void IRQ_extint0 void status RUNMODE EIRR0_ER0 0 clear ext int 0 request flag ENIR0_EN0 0 disable ext int0 EIRR0_ER1 0 clear ext int 1 request flag ENIR0_EN1 1 enable ext int1 ISR external I...

Страница 16: ...TSU 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 ICR 18 0xFF 8 6 Priority Level 6 for External Interrupt 1 of MB96340 Series __interrupt void IRQ_extint0 void Prototype EXT0 __interrupt void IRQ_extint1 ...

Страница 17: ...FUJITSU MICROELECTRONICS ACCEPTS NO RESPONSIBILITY OR LIABILITY FOR ANY ERRORS OR ELIGIBILITY FOR ANY PURPOSES C Fujitsu Microelectronics Europe GmbH Initialise external int 0 void Init_extint0 void ADER2_ADE16 0 select IO mode PIER07_IE0 1 ENIR0_EN0 0 disable ext int 0 ELVR0_LA0 1 ELVR0_LB0 1 LB0 LA0 11 falling edge EIRR0_ER0 0 clear ext int 0 request flag Request stop mode void Request_stop void...

Страница 18: ...Information Information about FUJITSU Microcontrollers can be found on the following Internet page http mcu emea fujitsu com The software examples related to this application note is 96340_irq_ext 96340_irq_ext_stop_wakeup It can be found on the following Internet page http mcu emea fujitsu com mcu_product mcu_all_software htm ...

Страница 19: ...U AN 300203 E V17 List of Figures Figure 2 1 External Interrupts Block Diagram 6 Figure 2 2 External Interrupts Connection Diagram 6 Figure 3 1 External Interrupt Timing 8 Figure 4 1 Interrupt Timing Disturbed Input Signal 10 Figure 4 2 Sequence Diagram Disturbed Input Signal 11 ...

Страница 20: ...EXTERNAL INTERRUPTS List of Tables MCU AN 300203 E V17 20 Fujitsu Microelectronics Europe GmbH List of Tables Table 2 1 ELVR 7 ...

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