ATTINY45-20SH
8-bit AVR microcontrollers with 4KB Flash memory for versatile applications
Manufacturer： ['microchip', 'atmel']
series introduction
# Introduction to the ATTINY45 - 20SH Product Series
## 1. Overview
The ATTINY45 - 20SH is a remarkable member of the ATTINY microcontroller product family developed by Microchip Technology. Renowned for its compact size, high - performance capabilities, and energy - efficiency, this product series is designed to meet the diverse needs of a wide range of embedded applications. Whether it's for consumer electronics, industrial control systems, or Internet of Things (IoT) devices, the ATTINY45 - 20SH offers a reliable and cost - effective solution.
## 2. Key Features
### 2.1 Microcontroller Core
- **AVR Architecture**: The ATTINY45 - 20SH is based on the high - performance AVR RISC (Reduced Instruction Set Computing) architecture. This architecture provides a large number of general - purpose working registers, which allows for efficient execution of instructions. With a rich set of instructions, it can perform complex operations with relatively simple code, enabling developers to write more concise and efficient programs.
- **Clock Speed**: It operates at a maximum clock speed of 20 MHz. This high clock speed enables the microcontroller to handle tasks quickly, such as real - time data processing, sensor data acquisition, and control signal generation.
### 2.2 Memory
- **Flash Memory**: The device is equipped with 4 KB of in - system self - programmable Flash memory. This non - volatile memory is used to store the program code. The in - system self - programmability feature allows for easy firmware updates, which is crucial for product development and maintenance. Developers can use various programming interfaces, such as the Serial Peripheral Interface (SPI), to reprogram the Flash memory without removing the microcontroller from the circuit board.
- **SRAM**: There is 256 bytes of Static Random - Access Memory (SRAM). SRAM is used for storing temporary data during program execution, such as variables, buffers, and intermediate results. The sufficient SRAM capacity ensures smooth operation of the microcontroller when dealing with data - intensive tasks.
- **EEPROM**: It also has 256 bytes of Electrically Erasable Programmable Read - Only Memory (EEPROM). EEPROM is non - volatile and can be used to store important data that needs to be retained even when the power is turned off, such as calibration data, configuration settings, and user - defined parameters.
### 2.3 Peripherals
#### 2.3.1 I/O Ports
- The ATTINY45 - 20SH features 6 general - purpose I/O (GPIO) pins. These pins can be configured as either input or output, providing flexibility for interfacing with external devices. For example, they can be used to connect sensors, actuators, displays, or communication modules. The GPIO pins also support pull - up and pull - down resistors, which can be enabled to ensure stable input levels.
#### 2.3.2 Timer/Counters
- It includes two 8 - bit timer/counters (Timer0 and Timer1). These timer/counters can be used for a variety of purposes, such as generating accurate time delays, measuring time intervals, and generating Pulse Width Modulation (PWM) signals. PWM signals are commonly used for controlling the speed of motors, adjusting the brightness of LEDs, and other applications that require variable power output.
#### 2.3.3 Analog - to - Digital Converter (ADC)
- The microcontroller is equipped with a 10 - bit successive - approximation ADC. This ADC can convert analog input signals from external sensors (such as temperature sensors, light sensors, or pressure sensors) into digital values. The 10 - bit resolution provides a relatively high level of accuracy, allowing
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