2.1 Common Peripherals

The following table shows the list of peripherals that are present in both families:

Peripherals/FeaturesATmega16ATmega32ATmega64ATmega128AVR® DA FamilyAVR® DB Family
Maximum Frequency16 MHz (VDD ≥ 4.5V)16 MHz (VDD ≥ 4.5V)16 MHz (VDD ≥ 4.5V)16 MHz (VDD ≥ 4.5V)24 MHz24 MHz
Supply voltage (VDD)1.8–5.5V1.8–5.5V1.8–5.5V1.8–5.5V1.8–5.5V1.8–5.5V
Package (pin number)40, 4440, 44646428, 32, 48, 6428, 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 KB2 KB4 KB4 KB4-16 KB4-16 KB
EEPROM512 bytes1 KB2 KB4 KB512 bytes512 bytes
GPIO323253535151
USART112255
SPI111122
TWI (I2C)111122
8-bit Timer/Counter2222-(1)-(1)
12-bit Timer/Counter----11
16-bit Timer/Counter11117(1)7(1)
Real Time Counter (RTC)111111
Analog Comparator (AC)111133
Analog-to-Digital Converter (ADC)111111
Watchdog Timer (WDT)111111
Note:
  1. For AVR Dx, each TCA in the Split mode works as two separate 8-bit timers, each of them having three compare channels for PWM generation.