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Atmel ATtiny26 User Manual
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4
ATtiny26(L)
1477G–AVR–03/0
5
Bloc
k Dia
gram
Figure 1.
The ATtiny26(L) Blo
c
k Diagram
WATCHDOG
TIMER
MCU CONTROL
REGISTER
UNIVERSAL
SERIAL
INTERFACE
TIMER/
COUNTER0
DATA DIR.
REG.PORT A
DATA REGISTER
PORT A
PROGRAMMING
LOGIC
TIMING AND
CONTROL
TIMER/
COUNTER1
MCU STATUS
REGISTER
PORT A DRIVERS
PA0-PA7
VCC
GND
+
-
ANALOG
COMPARATOR
8-BIT DATA BUS
ADC
ISP INTERFACE
INTERRUPT
UNIT
EEPROM
INTERNAL
OSCILLATOR
OSCILLATORS
CALIBRATED
OSCILLATOR
INTERNAL
DATA DIR.
REG.PORT B
DATA REGISTER
PORT B
PORT B DRIVERS
PB0-PB7
PROGRAM
COUNTER
STACK
POINTER
PROGRAM
FLASH
SRAM
GENERAL
PURPOSE
REGISTERS
INSTRUCTION
REGISTER
INSTRUCTION
DECODER
STATUS
REGISTER
Z
Y
X
ALU
CONTROL
LINES
AVCC
3
5
Table of Contents
Table of Contents Features
1
Pin Configuration
2
Description
3
Block Diagram
4
Pin Descriptions
5
About Code Examples
5
AVR CPU Core
6
Architectural Overview
6
General Purpose Register File
7
ALU - Arithmetic Logic Unit
8
Status Register - SREG
9
Stack Pointer - SP
10
Program and Data Addressing Modes
10
Memories
15
In-System Programmable Flash Program Memory
16
SRAM Data Memory
16
EEPROM Data Memory
17
I/O Memory
20
System Clock and Clock Options
22
Clock Systems and Their Distribution
22
Clock Sources
24
Default Clock Source
25
Crystal Oscillator
25
Low-Frequency Crystal Oscillator
26
External RC Oscillator
27
Calibrated Internal RC Oscillator
28
External Clock
29
High Frequency PLL Clock - PLLCLK
30
System Control and Reset
31
Power-On Reset
32
External Reset
33
Brown-Out Detection
34
Watchdog Reset
34
MCU Status Register - MCUSR
35
Power Management and Sleep Modes
36
MCU Control Register - MCUCR
36
Idle Mode
37
ADC Noise Reduction Mode
37
Power-Down Mode
37
Standby Mode
38
Minimizing Power Consumption
39
I/O Ports
41
Introduction
41
Ports as General Digital I/O
42
Alternate Port Functions
46
Register Description for I/O Ports
56
Interrupts
57
Interrupt Vectors
57
Interrupt Handling
58
External Interrupt
62
Pin Change Interrupt
62
Timer/Counters
64
Timer/Counter0 Prescaler
64
Timer/Counter1 Prescaler
65
8-Bit Timer/Counter0
65
8-Bit Timer/Counter1
67
Watchdog Timer
78
Universal Serial Interface - USI
80
Overview
80
Register Descriptions
81
Functional Descriptions
85
Alternative USI Usage
90
Analog Comparator
91
Analog to Digital Converter
94
Features
94
Operation
95
Prescaling and Conversion Timing
96
Changing Channel or Reference Selection
98
ADC Noise Canceler Function
99
ADC Conversion Result
99
Scanning Multiple Channels
105
ADC Noise Canceling Techniques
105
Offset Compensation Schemes
105
Memory Programming
107
Program and Data Memory Lock Bits
107
Fuse Bits
108
Signature Bytes
109
Calibration Byte
109
Page Size
109
Parallel Programming Parameters, Pin Mapping, and Commands
109
Parallel Programming
112
Serial Downloading
121
Serial Programming Pin Mapping
121
Electrical Characteristics
126
Absolute Maximum Ratings
126
DC Characteristics
126
External Clock Drive Waveforms
128
External Clock Drive
128
ADC Characteristics
129
Attiny26 Typical Characteristics
131
Register Summary
168
Instruction Set Summary
169
Ordering Information
171
Packaging Information
172
20P3
172
173
173
32M1-A
174
Errata
175
Attiny26, All Revisions
175
Datasheet Revision History
176
Changes from Rev. 1477F-12/04 to Rev. 1477G-03/05
176
Changes from Rev. 1477E-10/03 to Rev. 1477F-12/04
176
Changes from Rev. 1477D-05/03 to Rev. 1477E-10/03
176
Changes from Rev. 1477C-09/02 to Rev. 1477D-05/03
176
Changes from Rev. 1477B-04/02 to Rev. 1477C-09/02
177
Changes from Rev. 1477A-03/02 to Rev. 1477B-04/02
177
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Atmel ATtiny26 Specifications
General
Brand
Atmel
Model
ATtiny26
Category
Microcontrollers
Language
English
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