ATTINY45-20SI Atmel, ATTINY45-20SI Datasheet - Page 7
![IC AVR MCU 4K 20MHZ 8SOIC](/photos/6/50/65032/453-8-soic_sml.jpg)
ATTINY45-20SI
Manufacturer Part Number
ATTINY45-20SI
Description
IC AVR MCU 4K 20MHZ 8SOIC
Manufacturer
Atmel
Series
AVR® ATtinyr
Specifications of ATTINY45-20SI
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
USI
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
6
Program Memory Size
4KB (2K x 16)
Program Memory Type
FLASH
Eeprom Size
256 x 8
Ram Size
256 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 4x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
8-SOIC (5.3mm Width), 8-SOP, 8-SOEIAJ
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATTINY45-20SI
Manufacturer:
ATMEL
Quantity:
126
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4. AVR CPU Core
4.1
4.2
2586M–AVR–07/10
Introduction
Architectural Overview
This section discusses the AVR core architecture in general. The main function of the CPU core
is to ensure correct program execution. The CPU must therefore be able to access memories,
perform calculations, control peripherals, and handle interrupts.
Figure 4-1.
In order to maximize performance and parallelism, the AVR uses a Harvard architecture – with
separate memories and buses for program and data. Instructions in the Program memory are
executed with a single level pipelining. While one instruction is being executed, the next instruc-
tion is pre-fetched from the Program memory. This concept enables instructions to be executed
in every clock cycle. The Program memory is In-System Reprogrammable Flash memory.
Control Lines
Instruction
Instruction
Program
Memory
Block Diagram of the AVR Architecture
Register
Decoder
Flash
Program
Counter
and Control
EEPROM
Registrers
I/O Lines
Purpose
General
SRAM
Data Bus 8-bit
Status
32 x 8
Data
ALU
I/O Module 2
Comparator
I/O Module1
I/O Module n
Watchdog
Interrupt
Timer
Analog
Unit
7
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