Arduino mega to atmega2560 pinout2/17/2024 You don't need to care about MCUCR, unless you want to disable pull-up on all pins. Port B and bit 7.īit 7 in DDR B controls the direction (input/output)īit 7 in PORT B controls the output (high/low) You can find which Arduino pin is connected to which ATMega pin in schematic.Įxample: Controlling Arduino pin 13 find the port and bit for Arduino pin 13īy looking at the pinout map above, you will find "PB7" next to pin 13.Īrduino pin 13 is connected to ATMega2560 pin P B7 on the Arduino circuit board. The pinout map above is derived from the schematic. Look at the schematic for Arduino Mega and the ATMega2560 Datasheet The tan box in the pinout map below shows the pin name assigned by Atmel (who makes the chip). To toggle a given Arduino pin, you will need the x (port) and n (bit) to locate the registers and bits. “x” represents the numbering letter for the port, and “n” represents the bit number.įinding the registers for a given Arduino pin PUD in MCUCR disables all pull-up resistors if it is set to 1. PORTxn bit in PORTx register controls the output (high/low digitalWrite()) Three bits in three registers control the state of a GPIO pin:ĭDxn bit in DDRx register controls the direction (input/output pinMode()) The I/O section from the ATMega2560 datasheet (linked below) explains how to configure and toggle a GPIO (General Purpose Input/Output) pin. 4 pinMode() and digitalWrite() under the hood.3.3 set the Arduino pin 13 as input (equivalent to pinMode(13,INPUT)).The digital input/output pins are 54 where 15 of these pins will supply PWM o/p. The input voltage will range from 6volts to 20volts. The recommended Input Voltage will range from 7volts to 12volts. The operating voltage of this microcontroller is 5volts. 3.2 set the Arduino pin 13 as output (equivalent to pinMode(13,OUTPUT)) The specifications of Arduino Mega include the following.3.1 find the port and bit for Arduino pin 13.2 Finding the registers for a given Arduino pin.
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