This is the clock shared between this controller and other system for accurate data transfer. When controller acts as slave, the data is sent to master by this controller through this pin. OC2 (Timer/Counter2 Output Compare Match Output)

When controller acts as slave, the data is received by this pin. OC1B (Timer/Counter1 Output Compare Match B Output) This pin is low when controller acts as slave. OC1A (Timer/Counter1 Output Compare Match A Output) The divided system clock can be output on the PB0 pin) OC0A(PWM - Timer/Counter0 Output Compare Match A Output)ĬLKO (Divided System Clock. OC0B(PWM - Timer/Counter0 Output Compare Match B Output) XTAL1 (Chip Clock Oscillator pin 1 or External clock input) OC2B(PWM - Timer/Counter2 Output Compare Match B Output) PC6 can only be used as I/O pin when RSTDISBL Fuse is programmed. We will describe functions of each pin in below table. Many pins of the chip here have more than one function. This blog covers ATMEGA328P Microcontroller pinout, datasheet, equivalent, features and other information on how to use and where to use this device.ĪTMEGA328P is a 28-pin chip as shown in pin diagram above. O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.ATMEGA328P is a Microcontroller. Get Exploring Arduino: Tools and Techniques for Engineering Wizardry now with the O’Reilly learning platform. In most cases, the first page tells you all you need to know about the features of that MCU. When you have the datasheet in hand, start by reviewing the first page (see Figure A-1). The datasheets for the MCUs used in the Arduinos can also be found on the hardware page for each board on the website. I recommend just doing a Google search for “ATMega 328p datasheet” and looking for the first PDF link from Atmel. Finding a datasheet can often be the trickiest part.

Recall that the ATMega 328p is the microcontroller unit (MCU) used in the Arduino Uno and many Arduino clones. Breaking Down a DatasheetĬonsider the datasheet for the Atmel ATMega 328p, for instance.

Just about any electronic component that you can buy has an associated datasheet that contains info about the technical limits of the part, instructions on how to use its capabilities, and so forth. One of the most important skills that you can develop as an engineer is the ability to read datasheets. Further, taking a look at the open source schematics for the Arduino Uno will make it easier to understand how an Arduino actually works. This appendix does not summarize the features of all the microcontrollers in all the Arduinos, but it is a useful exercise to investigate an ATMega datasheet to get a better idea about how it works. APPENDIX Deciphering the ATMega Datasheet and Arduino SchematicsĪt the heart of all Arduinos is an Atmel microcontroller.

Arduino uno 328p datasheet