ATMega8 Microcontroller IC (DIP-Type 28 Pins)

The ATmega8 is a popular 8-bit microcontroller from Atmel (now part of Microchip Technology), and it is part of the AVR family of microcontrollers. The ATmega8 is commonly used in embedded systems and DIY electronics projects, and it comes in various package types, including the DIP (Dual In-line Package) form, which is a through-hole package with two rows of pins.

Key Features of ATmega8:

1. Microcontroller Type: 8-bit RISC (Reduced Instruction Set Computing).
2. Architecture: AVR architecture (efficient and simple).
3. Operating Voltage: Typically operates between 2.7V to 5.5V.
4. Flash Memory: 8 KB of flash memory for program storage.
5. SRAM: 1 KB of SRAM (Static RAM) for data storage.
6. EEPROM: 512 bytes of EEPROM for non-volatile data storage.
7. Clock Speed: Can run up to 16 MHz with an external crystal oscillator.
8. I/O Pins: 23 programmable I/O lines (general-purpose).
9. Timers: 3 timers (2 8-bit and 1 16-bit).
10. ADC: 10-bit ADC with up to 8 input channels.
11. Communication Interfaces:

• USART (Universal Synchronous and Asynchronous serial Receiver and Transmitter).
• SPI (Serial Peripheral Interface).
• I2C (Two-wire Interface).

ATmega8 Pinout (DIP Package):

The DIP-28 package of the ATmega8 has 28 pins. Here’s the basic pinout:

1. Pin 1 (PC6/RESET): Reset pin (active low).
2. Pin 2 (PD0/RXD): USART Receive Data (RX).
3. Pin 3 (PD1/TXD): USART Transmit Data (TX).
4. Pin 4 (PD2/INT0): External Interrupt 0.
5. Pin 5 (PD3/INT1): External Interrupt 1.
6. Pin 6 (PD4): General-purpose I/O.
7. Pin 7 (PD5/TDO): General-purpose I/O.
8. Pin 8 (PD6/TDI): General-purpose I/O.
9. Pin 9 (PD7/ADC0): General-purpose I/O and ADC Channel 0.
10. Pin 10 (PC0/ADC1): General-purpose I/O and ADC Channel 1.
11. Pin 11 (PC1/ADC2): General-purpose I/O and ADC Channel 2.
12. Pin 12 (PC2/ADC3): General-purpose I/O and ADC Channel 3.
13. Pin 13 (PC3/ADC4): General-purpose I/O and ADC Channel 4.
14. Pin 14 (PC4/ADC5): General-purpose I/O and ADC Channel 5.
15. Pin 15 (PC5/SCL): I2C Clock (SCL).
16. Pin 16 (VCC): Power supply (typically +5V).
17. Pin 17 (GND): Ground.
18. Pin 18 (AVCC): Analog power supply.
19. Pin 19 (AREF): Analog Reference (used for ADC).
20. Pin 20 (PC7/ADC6): General-purpose I/O and ADC Channel 6.
21. Pin 21 (PB0/SS): SPI Slave Select (SS).
22. Pin 22 (PB1/SCK): SPI Clock (SCK).
23. Pin 23 (PB2/MISO): SPI Master In Slave Out (MISO).
24. Pin 24 (PB3/MOSI): SPI Master Out Slave In (MOSI).
25. Pin 25 (PB4/OC1A): Output Compare A (for timer).
26. Pin 26 (PB5/OC1B): Output Compare B (for timer).
27. Pin 27 (PB6/ICP): Input Capture (for timer).
28. Pin 28 (PB7): General-purpose I/O.

ATmega8 Pin Functionality Summary:

• Digital I/O Pins: The ATmega8 has 23 I/O pins that can be configured as inputs or outputs.
• Analog-to-Digital Converter (ADC): The microcontroller features an 8-channel 10-bit ADC, allowing it to read analog signals.
• PWM (Pulse Width Modulation): Pins like PB3 (OC1A) and PB4 (OC1B) support PWM signals, useful for motor control and other applications.
• Timers: The ATmega8 includes timers, useful for generating delays, PWM, or capturing input signals.
• USART (Universal Synchronous/Asynchronous Receiver/Transmitter): Used for serial communication.
• SPI and I2C: The ATmega8 supports both SPI and I2C protocols, enabling communication with other microcontrollers and devices.

Applications of ATmega8:

• Embedded Systems: Commonly used in robotics, control systems, and automation projects.
• Arduino Projects: The ATmega8 is the core of some earlier Arduino boards, such as the Arduino NG.
• DIY Electronics: Ideal for students, hobbyists, and engineers building simple embedded systems.
• Communication Devices: Due to its USART, SPI, and I2C support, the ATmega8 is used in communication systems.

Programming the ATmega8:

The ATmega8 can be programmed using the AVR-GCC toolchain and AVRISP (in-circuit serial programming) or via Arduino IDE (if the chip is used on an Arduino board). You can program the chip using a USBasp programmer or a similar device.

Origin: China

Brand: Atmel