ATtiny25 datasheet(46/196 Pages) ATMEL

46 / 196 page

7598H–AVR–07/09

ATtiny25/45/85

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 ATtiny25/45/85 is:

Address Labels Code

Comments

0x0000

rjmp

RESET

; Reset Handler

0x0001

rjmp

EXT_INT0

; IRQ0 Handler

0x0002

rjmp

PCINT0

; PCINT0 Handler

0x0003

rjmp

TIM1_COMPA

; Timer1 CompareA Handler

0x0004

rjmp

TIM1_OVF

; Timer1 Overflow Handler

0x0005

rjmp

TIM0_OVF

; Timer0 Overflow Handler

0x0006

rjmp

EE_RDY

; EEPROM Ready Handler

0x0007

rjmp

ANA_COMP

; Analog Comparator Handler

0x0008

rjmp

ADC

; ADC Conversion Handler

0x0009

rjmp

TIM1_COMPB

; Timer1 CompareB Handler

0x000A

rjmp

TIM0_COMPA

;

0x000B

rjmp

TIM0_COMPB

;

0x000C

rjmp

WDT

;

0x000D

rjmp

USI_START

;

0x000E

rjmp

USI_OVF

;

0x000F

RESET: ldi

r16, low(RAMEND); Main program start

0x0010

ldi

r17, high(RAMEND); Tiny85 has also SPH

0x0011

out

SPL, r16

; Set Stack Pointer to top of RAM

0x0012

out

SPH, r17

; Tiny85 has also SPH

0x0013

sei

; Enable interrupts

0x0014

<instr>

xxx

...

10. I/O Ports

10.1

Introduction

All AVR ports have true Read-Modify-Write functionality when used as general digital I/O ports.

This means that the direction of one port pin can be changed without unintentionally changing

the direction of any other pin with the SBI and CBI instructions. The same applies when chang-

ing drive value (if configured as output) or enabling/disabling of pull-up resistors (if configured as

input). Each output buffer has symmetrical drive characteristics with both high sink and source

capability. The pin driver is strong enough to drive LED displays directly. All port pins have indi-

vidually selectable pull-up resistors with a supply-voltage invariant resistance. All I/O pins have

protection diodes to both V

CC and Ground as indicated in Figure 10-1. Refer to “Electrical Char-

acteristics” on page 150 for a complete list of parameters.

ATtiny25 датащи(PDF) 46 Page - ATMEL Corporation

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