The following table shows the list of peripherals that are present in both families:
| Peripherals/Features | ATmega16 | ATmega32 | ATmega64 | ATmega128 | AVR® DA Family | AVR® DB Family |
|---|---|---|---|---|---|---|
| Maximum Frequency | 16 MHz (VDD ≥ 4.5V) | 16 MHz (VDD ≥ 4.5V) | 16 MHz (VDD ≥ 4.5V) | 16 MHz (VDD ≥ 4.5V) | 24 MHz | 24 MHz |
| Supply voltage (VDD) | 1.8–5.5V | 1.8–5.5V | 1.8–5.5V | 1.8–5.5V | 1.8–5.5V | 1.8–5.5V |
| Package (pin number) | 40, 44 | 40, 44 | 64 | 64 | 28, 32, 48, 64 | 28, 32, 48, 64 |
Flash memory (Read-while-write section) |
16 KB (14 KB) |
32 KB (28 KB) |
64 KB (56 KB) |
128 KB (120 KB) |
32-128 KB - |
32-128 KB - |
| RAM memory | 1 KB | 2 KB | 4 KB | 4 KB | 4-16 KB | 4-16 KB |
| EEPROM | 512 bytes | 1 KB | 2 KB | 4 KB | 512 bytes | 512 bytes |
| GPIO | 32 | 32 | 53 | 53 | 51 | 51 |
| USART | 1 | 1 | 2 | 2 | 5 | 5 |
| SPI | 1 | 1 | 1 | 1 | 2 | 2 |
| TWI (I2C) | 1 | 1 | 1 | 1 | 2 | 2 |
| 8-bit Timer/Counter | 2 | 2 | 2 | 2 | -(1) | -(1) |
| 12-bit Timer/Counter | - | - | - | - | 1 | 1 |
| 16-bit Timer/Counter | 1 | 1 | 1 | 1 | 7(1) | 7(1) |
| Real Time Counter (RTC) | 1 | 1 | 1 | 1 | 1 | 1 |
| Analog Comparator (AC) | 1 | 1 | 1 | 1 | 3 | 3 |
| Analog-to-Digital Converter (ADC) | 1 | 1 | 1 | 1 | 1 | 1 |
| Watchdog Timer (WDT) | 1 | 1 | 1 | 1 | 1 | 1 |