Interrupt Vectors

Interrupt vectors are described in the table below.

Table 1. Reset and Interrupt Vectors
Vector No.	Program Address	Source	Interrupt Definition
1	0x000	RESET	External Pin, Power-on Reset, VLM Reset and Watchdog Reset
2	0x001	INT0	External Interrupt Request 0
3	0x002	PCINT0	Pin Change Interrupt Request 0
4	0x003	TIM0_CAPT	Timer/Counter0 Capture
5	0x004	TIM0_OVF	Timer/Counter0 Overflow
6	0x005	TIM0_COMPA	Timer/Counter0 Compare Match A
7	0x006	TIM0_COMPB	Timer/Counter0 Compare Match B
8	0x007	ANA_COMP	Analog Comparator
9	0x008	WDT	Watchdog Time-out Interrupt
10	0x009	VLM	V_CC Voltage Level Monitor
11	0x00A	ADC	ADC Conversion Complete⁽¹⁾

Note:

The ADC is only available in ATtiny5/10.

In case the program never enables an interrupt source, the Interrupt Vectors will not be used and, consequently, regular program code can be placed at these locations.

The most typical and general program setup for the Reset and Interrupt Vector Addresses in this device is:

Address	Labels	Code	Comments
0x000	rjmp	RESET	; Reset Handler
0x001	rjmp	INT0	; IRQ0 Handler
0x002	rjmp	PCINT0	; PCINT0 Handler
0x003	rjmp	TIM0_CAPT	; Timer0 Capture Handler
0x004	rjmp	TIM0_OVF	; Timer0 Overflow Handler
0x005	rjmp	TIM0_COMPA	; Timer0 Compare A Handler
0x006	rjmp	TIM0_COMPB	; Timer0 Compare B Handler
0x007	rjmp	ANA_COMP	; Analog Comparator Handler
0x008	rjmp	WDT	; Watchdog Interrupt Handler
0x009	rjmp	VLM	; Voltage Level Monitor Handler
0x00A	rjmp	ADC	; ADC Conversion Handler
<continues>	...	...	...
<continued>
0x000B	RESET: ldi	r16, high (RAMEND)	; Main program start
0x000C	out	SPH,r16	; Set Stack Pointer
0x000D	ldi	r16, low (RAMEND)	; to top of RAM
0x000E	out	SPL,r16
0x000F	sei		; Enable interrupts
0x0010	<instr>
...	...