The Atmega328 is a low-power 8-bit microcontroller based on AVR architecture that can achieve throughputs of 1 MIPS per MHz. It has 32KB of flash memory, 1KB of EEPROM, 2KB of SRAM, 3 I/O ports, 32 general purpose registers, and a 16-bit timer/counter that can generate delays of up to 262ms when running on a 16MHz oscillator.

2. Content
• What is ATMEGA 328?
• Features of ATMEGA 328
• Pin Description of ATMEGA 328
• Delay Calculation

3. WHAT IS ATMEGA 328?
• Atmega328 is a low power CMOS 8-bit microcontroller based
on the AVR enhanced RISC architecture. By executing
powerful instructions in a single clock cycle, the controller
achieves throughputs approaching 1 MIPS per MHz awing the
system designer to optimize power consumption.

4. • ATMEGA-328
ATMEL
FREQUENCY IN
MEGAHz
32kBYTE FLASH MEMORY

5. FEATURES OF ATMEGA 328
• High-performance, Low-power AVR 8-bit
Microcontroller.
• Advanced RISC Architecture .
• 32 8-bit GP registers.
• 3 8-bit I/O ports.
• 32 KB flash memory.
• 1 KB EEPROM & 2 KB SRAM.
• On chip 10 bit A/D converter.
• 16-bit timer.

6. Pin Description

7. Delay Calculation
16 bit Timer/ Counter register
(TCNT1)
TCNT1H TCNT1L
(Higher Byte) (Lower Byte)
 Max. Delay of 262ms with 16 MHz oscillator
 Max. counting value 2^16=65536