Symbols and Footprint
| part number | ATmega164P |
| manufacturer | Atmel |
| lead free | ??? |
| prefix | U |
| Description | ATmega164P |
| octopart part number | |
| package | |
| RoHS | ??? |
| pin 21 description | port D |
| pin 2 description | clock output; port B |
| pin 39 description | port A |
| pin 20 description | port D |
| pin 4 description | port B |
| pin 7 description | SPI master input/slave output; port B |
| pin 8 description | SPI master clock; port B |
| pin 40 description | port A |
| pin 6 description | SPI master output/slave input; port B |
| pin 36 description | port A |
| pin 5 description | SPI slave select; port B |
| pin 16 description | external interrupt 0; port D |
| pin 25 description | JTAG test mode select; port C |
| pin 37 description | port A |
| Internal SRAM | 1K (ATmega164P) 2K (ATmega324P) 4K (ATmega644P) 16K (ATmega1284P)bytes |
| pin 27 description | JTAG test data input; port C |
| pin 3 description | external interrupt 2; port B |
| pin 19 description | port D |
| pin 34 description | port A |
| pin 32 description | analog reference for A/D converter |
| Programmable I/O lines | 32 |
| pin 13 description | clock oscillator pin 1 |
| pin 17 description | external interrupt 1; port D |
| pin 31 description | ground |
| pin 14 description | port D |
| pin 18 description | port D |
| pin 26 description | JTAG test data output; port C |
| pin 15 description | port D |
| pin 9 activelow | True |
| pin 35 description | port A |
| pin 1 description | port B |
| pin 29 description | timer oscillator pin 2; port C |
| pin 23 description | 2-wire data line; port C |
| pin 10 description | supply voltage |
| pin 28 description | timer oscillator pin 1; port C |
| pin 24 description | JTAG test clock; port C |
| pin 38 description | port A |
| pin 5 activelow | True |
| pin 12 description | clock oscillator pin 2 |
| pin 9 description | reset (active low) |
| pin 30 descriptionp | A/D converter supply voltage |
| pin 33 description | port A |
| pin 11 description | ground |
| Flash memory | 16K (ATmega164P) 32K (ATmega324P) 64K (ATmega644P) 128K (ATmega1284P) bytes |
| pin 22 description | 2-wire clock line; port C |
| EEPROM | 512 (ATmega164P) 1K (ATmega324P) 2K (ATmega644P) 4K (ATmega1284P)bytes |
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