| Pins |
8 |
14 |
8 |
14 |
20 |
| SRAM |
128B |
128B |
256B |
256B |
256B |
| Flash |
2 KB |
2 KB |
4 KB |
4 KB |
4 KB |
| EEPROM |
64B |
64B |
128B |
128B |
128B |
| Max. frequency (MHz) |
20 |
20 |
20 |
20 |
20 |
| 16-bit Timer/Counter type A (TCA) |
1 |
1 |
1 |
1 |
1 |
| 16-bit Timer/Counter type B (TCB) |
1 |
1 |
1 |
1 |
1 |
| 12-bit Timer/Counter type D (TCD) |
No |
No |
No |
No |
No |
| Real-Time Counter (RTC) |
1 |
1 |
1 |
1 |
1 |
| Universal Synchronous and Asynchronous Receiver and Transmitter (USART) |
1 |
1 |
1 |
1 |
1 |
| Serial Peripheral Interface (SPI) |
1 |
1 |
1 |
1 |
1 |
| Two-Wire Interface (TWI/I2C) |
1 |
1 |
1 |
1 |
1 |
| Analog-to-Digital Converter (ADC) |
1 |
1 |
1 |
1 |
1 |
| ADC channels |
6 |
10 |
6 |
10 |
12 |
| Digital-to-Analog Converter (DAC) |
No |
No |
No |
No |
No |
| Analog Comparator (AC) |
1 |
1 |
1 |
1 |
1 |
| AC inputs |
1p/1n |
1p/1n |
1p/1n |
1p/1n |
2p/2n |
| Peripheral Touch Controller (PTC) |
No |
No |
No |
No |
No |
| Configurable Custom Logic (CCL) |
1 |
1 |
1 |
1 |
1 |
| Watchdog Timer (WDT) |
1 |
1 |
1 |
1 |
1 |
| Event System (EVSYS) channels |
3 |
3 |
3 |
3 |
3 |
| General Purpose I/O |
6 |
12 |
6 |
12 |
18 |
| External Interrupts |
6 |
12 |
6 |
12 |
18 |
| Cyclic Redundancy Check Memory Scan (CRCSCAN) |
1 |
1 |
1 |
1 |
1 |
| Unified Program and Debug Interface (UPDI) |
1 |
1 |
1 |
1 |
1 |