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8-bit AVR, 32KB flash — the Arduino Uno chip
| Part number | ATmega328P |
|---|---|
| Category | Microcontrollers & Processors › AVR (ATmega / ATtiny) |
| Package | DIP-28 |
| Pins | 28 |
| Resolution | 8 bit |
ATmega328P pinout
| Pin | Name | Type | Description |
|---|---|---|---|
| 1 | ~RESET/PC6 | bidirectional | |
| 2 | PD0 | bidirectional | |
| 3 | PD1 | bidirectional | |
| 4 | PD2 | bidirectional | |
| 5 | PD3 | bidirectional | |
| 6 | PD4 | bidirectional | |
| 7 | VCC | power | |
| 8 | GND | ground | |
| 9 | XTAL1/PB6 | bidirectional | |
| 10 | XTAL2/PB7 | bidirectional | |
| 11 | PD5 | bidirectional | |
| 12 | PD6 | bidirectional | |
| 13 | PD7 | bidirectional | |
| 14 | PB0 | bidirectional | |
| 15 | PB1 | bidirectional | |
| 16 | PB2 | bidirectional | |
| 17 | PB3 | bidirectional | |
| 18 | PB4 | bidirectional | |
| 19 | PB5 | bidirectional | |
| 20 | AVCC | power | |
| 21 | AREF | passive | |
| 22 | GND | ground | |
| 23 | PC0 | bidirectional | |
| 24 | PC1 | bidirectional | |
| 25 | PC2 | bidirectional | |
| 26 | PC3 | bidirectional | |
| 27 | PC4 | bidirectional | |
| 28 | PC5 | bidirectional |
Schematic symbol and footprint
Schematic symbol
Footprint: DIP-28 — to scale, pad 1 in yellow (mm). Check against the datasheet before ordering PCBs.