| Pins |
24 |
14 |
20 |
24 |
| SRAM |
256B |
512B |
512B |
512B |
| Flash |
4 KB |
8 KB |
8 KB |
8 KB |
| EEPROM |
128B |
128B |
128B |
128B |
| Max. frequency (MHz) |
20 |
20 |
20 |
20 |
| 16-bit Timer/Counter type A (TCA) |
1 |
1 |
1 |
1 |
| 16-bit Timer/Counter type B (TCB) |
1 |
1 |
1 |
1 |
| 12-bit Timer/Counter type D (TCD) |
1 |
1 |
1 |
1 |
| Real-Time Counter (RTC) |
1 |
1 |
1 |
1 |
| USART |
1 |
1 |
1 |
1 |
| SPI |
1 |
1 |
1 |
1 |
| TWI (I2C) |
1 |
1 |
1 |
1 |
| ADC |
1 |
1 |
1 |
1 |
| ADC channels |
12 |
10 |
12 |
12 |
| DAC |
1 |
1 |
1 |
1 |
| AC |
1 |
1 |
1 |
1 |
| AC inputs |
2p/2n |
1p/1n |
2p/2n |
2p/2n |
| Peripheral Touch Controller (PTC)(1) |
No |
1 |
1 |
1 |
| PTC number of self-capacitance channels |
- |
6 |
6 |
6 |
| PTC number of mutual capacitance channels |
- |
9 |
9 |
9 |
| Configurable Custom Logic |
1 |
1 |
1 |
1 |
| Window Watchdog |
1 |
1 |
1 |
1 |
| Event System channels |
6 |
6 |
6 |
6 |
| General purpose I/O |
22 |
12 |
18 |
22 |
| External interrupts |
22 |
12 |
18 |
22 |
| CRCSCAN |
1 |
1 |
1 |
1 |