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10. Interrupts

This section describes the specifics of the interrupt handling as performed in ATtiny24/44/84. For a general explanation of the AVR interrupt handling, see ”Reset and Interrupt Handling” on page 13.

10.1Interrupt Vectors

Table 10-1.

Reset and Interrupt Vectors

 

Vector No.

Program Address

Source

Interrupt Definition

 

 

 

 

1

0x0000

RESET

External Pin, Power-on Reset,

Brown-out Reset, Watchdog Reset

 

 

 

 

 

 

 

2

0x0001

INT0

External Interrupt Request 0

 

 

 

 

3

0x0002

PCINT0

Pin Change Interrupt Request 0

 

 

 

 

4

0x0003

PCINT1

Pin Change Interrupt Request 1

 

 

 

 

5

0x0004

WDT

Watchdog Time-out

 

 

 

 

6

0x0005

TIMER1 CAPT

Timer/Counter1 Capture Event

 

 

 

 

7

0x0006

TIMER1 COMPA

Timer/Counter1 Compare Match A

 

 

 

 

8

0x0007

TIMER1 COMPB

Timer/Counter1 Compare Match B

 

 

 

 

9

0x0008

TIMER1 OVF

Timer/Counter0 Overflow

 

 

 

 

10

0x0009

TIMER0 COMPA

Timer/Counter0 Compare Match A

 

 

 

 

11

0x000A

TIMER0 COMPB

Timer/Counter0 Compare Match B

 

 

 

 

12

0x000B

TIMER0 OVF

Timer/Counter0 Overflow

 

 

 

 

13

0x000C

ANA_COMP

Analog Comparator

 

 

 

 

14

0x000D

ADC

ADC Conversion Complete

 

 

 

 

15

0x000E

EE_RDY

EEPROM Ready

 

 

 

 

16

0x000F

USI_START

USI START

 

 

 

 

17

0x0010

USI_OVF

USI Overflow

 

 

 

 

If the program never enables an interrupt source, the Interrupt Vectors are not used, and regular program code can be placed at these locations. The most typical and general program setup for the Reset and Interrupt Vector Addresses in ATtiny24/44/84 is:

50 ATtiny24/44/84

8006E–AVR–09/06

ATtiny24/44/84

Address

Labels Code

 

Comments

0x0000

 

rjmp

RESET

;

Reset Handler

0x0001

 

rjmp

EXT_INT0

;

IRQ0 Handler

0x0002

 

rjmp

PCINT0

;

PCINT0 Handler

0x0003

 

rjmp

PCINT1

;

PCINT1 Handler

0x0004

 

rjmp

WATCHDOG

;

Watchdog Interrupt Handler

0x0005

 

rjmp

TIM1_CAPT

;

Timer1 Capture Handler

0x0006

 

rjmp

TIM1_COMPA

;

Timer1 Compare A Handler

0x0007

 

rjmp

TIM1_COMPB

;

Timer1 Compare B Handler

0x0008

 

rjmp

TIM1_OVF

;

Timer1 Overflow Handler

0x0009

 

rjmp

TIM0_COMPA

;

Timer0 Compare A Handler

0x000A

 

rjmp

TIM0_COMPB

;

Timer0 Compare B Handler

0x000B

 

rjmp

TIM0_OVF

;

Timer0 Overflow Handler

0x000C

 

rjmp

ANA_COMP

;

Analog Comparator Handler

0x000D

 

rjmp

ADC

;

ADC Conversion Handler

0x000E

 

rjmp

EE_RDY

;

EEPROM Ready Handler

0x000F

 

rjmp

USI_STR

;

USI STart Handler

0x0010

 

rjmp

USI_OVF

;

USI Overflow Handler

;

 

 

 

 

 

0x0011

RESET: ldi

r16, high(RAMEND); Main program start

0x0012

 

out

SPH,r16

;

Set Stack Pointer to top of RAM

0x0013

 

ldi

r16, low(RAMEND)

 

0x0014

 

out

SPL,r16

 

 

0x0015

 

sei

 

;

Enable interrupts

0x0016

<instr>

xxx

 

 

...

...

... ...

 

 

51

8006E–AVR–09/06

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