It provides the voltage reference at which the microcontroller is currently operating. REF: This pin is the input/output reference. If this pin is supplied with 5 V, the board will reset automatically GND (Ground pins): There is a total of 5 ground pins on the board. UART pins on board: D0(TX), D1(RX) Other pins: It also represents the successful flow of data from the computer to the board. The TXD is used for transmitting the data, and RXD is used for receiving the data during serial communication. UART Pins: TXD and RXD pins are used for serial communication. This allows us to have multiple SPI peripheral devices sharing the same MISO, MOSI, and CLK lines.Įxternal Interrupts (2 and 3)- These pins can be used to trigger an external interrupt in the following conditions: a low value, a rising or falling edge, or a change in value. When its value HIGH, it ignores the master. When a device’s Slave Select pin value is LOW, it can communicate with the master. This line is used for sending data to the peripherals.
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