AVR interrupt causes restart-EEWORLD

Collect

If interrupts are enabled in AVR but there is no corresponding interrupt service function, the chip will restart. By analyzing the assembly code generated by the compilation, you can clearly understand the problem.

Compiler uses Atmel Atudio7.0

Chip: ATmega128A

Since no method was found to generate assembly code, ReAVR was used for disassembly.

The following is the case with ISR

#include

#include "avr/interrupt.h"

void initTimer3();

int main(void)

{

initTimer3();

be();

while(1)

{

}//while(1)

}

void initTimer3()

{

TCNT3=0x0000;

TCCR3B=0x01;

OCR3A=14745;

ETHYM=0x10;

}

ISR(TIMER3_COMPA_vect)

{

TCNT3=0x0000;

}

compilation

; reassembly of "Electronic Counter.hex"

; created by ReAVR V3.5.0

; at 2016/02/28 - 16:42:14

; for Atmel AVR assembler

;---------------------------------------

; AVR_TYPE=

; FLASH_SIZE=8KB

; SRAM_START=0x60

;---------------------------------------

.cseg

.org 0x0000

;---------------------------------------

; byte constants:

;

.equ k01 = 0x01 ;

.equ k10 = 0x10 ;

.equ k39 = 0x39 ; '9'

.equ k99 = 0x99 ;

.equ kFF = 0xFF ; '˙'

;

; io register addresses:

;

.equ p3D = 0x3D

.equ p3E = 0x3E

.equ p3F = 0x3F

;

; bit numbers:

;

.equ b0 = 0x00

.equ b1 = 0x01

.equ b2 = 0x02

.equ b3 = 0x03

.equ b4 = 0x04

.equ b5 = 0x05

.equ b6 = 0x06

.equ b7 = 0x07

;---------------------------------------

;

L0000:

jmp _reset ; L0046

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0067 //Vector number 27 TIMER3_COMPA

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

;

_reset:

; L0046:

clr r1

out p3F,r1

ldi r28, kFF

ldi r29,k10

out p3E,r29

out p3D,r28

call L0063

jmp L0075

; ----------- jump on last line

L0050: //Default interrupt service function, equivalent to triggering reset interrupt

jmp L0000

; ----------- jump on last line

L0052:

sts D0089,r1

sts D0088,r1

ldi r24,k01

sts D008A,r24

ldi r24,k99

ldi r25,k39

sts D0087,r25

sts D0086,r24

ldi r24,k10

sts D007D,r24

right

;----------------------*

; pc=0x63(0xC6)

;

L0063:

call L0052

L0066:

rjmp L0066

; ----------- jump on last line

; pc=0x67(0xCE)

;

L0067: //TIMER3_COMPA interrupt service function, normal

push r1

push r0

in r0,p3F

push r0

clr r1

sts D0089,r1

sts D0088,r1

pop r0

out p3F,r0

pop r0

pop r1

reti

;----------------------*

; pc=0x75(0xEA)

;

L0075:

cli

L0076:

rjmp L0076

; ----------- jump on last line

; pc=0x77(0xEE)

;

; last flash byte address = 0x00ED

; last flash word address = 0x0076

;---------------------------------------

.dseg

.org 0x007D

;

D007D:

.byte 9

D0086:

.byte 1

D0087:

.byte 1

D0088:

.byte 1

D0089:

.byte 1

D008A:

;

; last lds/sts data byte at 0x008A

;---------------------------------------

;

Assembly code without ISR

; reassembly of "Electronic Counter.hex"

; created by ReAVR V3.5.0

; at 2016/02/28 - 16:40:21

; for Atmel AVR assembler

;---------------------------------------

; AVR_TYPE=

; FLASH_SIZE=8KB

; SRAM_START=0x60

;---------------------------------------

.cseg

.org 0x0000

;---------------------------------------

; byte constants:

;

.equ k01 = 0x01 ;

.equ k10 = 0x10 ;

.equ k39 = 0x39 ; '9'

.equ k99 = 0x99 ;

.equ kFF = 0xFF ; '˙'

;

; io register addresses:

;

.equ p3D = 0x3D

.equ p3E = 0x3E

.equ p3F = 0x3F

;

; bit numbers:

;

.equ b0 = 0x00

.equ b1 = 0x01

.equ b2 = 0x02

.equ b3 = 0x03

.equ b4 = 0x04

.equ b5 = 0x05

.equ b6 = 0x06

.equ b7 = 0x07

;---------------------------------------

;

L0000:

jmp _reset ; L0046

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050 //vector number 27 TIMER3_COMPA

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

jmp L0050

; ----------- jump on last line

;

_reset:

; L0046:

clr r1

out p3F,r1

ldi r28, kFF

ldi r29,k10

out p3E,r29

out p3D,r28

call L0063

jmp L0067

; ----------- jump on last line

L0050: //Default interrupt service function, equivalent to triggering reset interrupt

jmp L0000

; ----------- jump on last line

L0052:

sts D0089,r1

sts D0088,r1

ldi r24,k01

sts D008A,r24

ldi r24,k99

ldi r25,k39

sts D0087,r25

sts D0086,r24

ldi r24,k10

sts D007D,r24

right

;----------------------*

; pc=0x63(0xC6)

;

L0063:

call L0052

L0066:

rjmp L0066

; ----------- jump on last line

; pc=0x67(0xCE)

;

L0067:

cli

L0068:

rjmp L0068

; ----------- jump on last line

; pc=0x69(0xD2)

;

; last flash byte address = 0x00D1

; last flash word address = 0x0068

;---------------------------------------

.dseg

.org 0x007D

;

D007D:

.byte 9

D0086:

.byte 1

D0087:

.byte 1

D0088:

.byte 1

D0089:

.byte 1

D008A:

;

; last lds/sts data byte at 0x008A

;---------------------------------------

;

Keywords：AVR Reference address：AVR interrupt causes restart

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