ATtiny44 datasheet(49/236 Pages) ATMEL

49 / 236 page

8006H–AVR–10/09

ATtiny24/44/84

Address

Labels Code

Comments

0x0000

rjmp

RESET

; Reset Handler

0x0001

rjmp

INT0

; IRQ0 Handler

0x0002

rjmp

PCINT0

; PCINT0 Handler

0x0003

rjmp

PCINT1

; PCINT1 Handler

0x0004

rjmp

WDT

; 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>

...

9.2

External Interrupts

The External Interrupts are triggered by the INT0 pin or any of the PCINT11..0 pins. Observe

that, if enabled, the interrupts will trigger even if the INT0 or PCINT11..0 pins are configured as

outputs. This feature provides a way of generating a software interrupt. Pin change 0 interrupts

PCI0 will trigger if any enabled PCINT7..0 pin toggles. Pin change 1 interrupts PCI1 will trigger if

any enabled PCINT11..8 pin toggles. The PCMSK0 and PCMSK1 Registers control which pins

contribute to the pin change interrupts. Pin change interrupts on PCINT11..0 are detected asyn-

chronously. This implies that these interrupts can be used for waking the part also from sleep

modes other than Idle mode.

The INT0 interrupts can be triggered by a falling or rising edge or a low level. This is set up as

indicated in the specification for the MCU Control Register – MCUCR. When the INT0 interrupt is

enabled and is configured as level triggered, the interrupt will trigger as long as the pin is held

low. Note that recognition of falling or rising edge interrupts on INT0 requires the presence of an

I/O clock, as described in “Clock Sources” on page 25.

9.2.1

Low Level Interrupt

A low level interrupt on INT0 is detected asynchronously. This means that the interrupt source

can be used for waking the part also from sleep modes other than Idle (the I/O clock is halted in

all sleep modes except Idle).

ATtiny44 Datasheet(PDF) 49 Page - ATMEL Corporation

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