Given below is the datasheet of ATmega32u4 by Atmel. UCAP: It is a USB pad for the Internal Regulator Output supply voltage that should be connected to an external capacitor. UGND/UVCC: These are the USB pads for Input supply voltage. These should be connected to USB D-/D+ ports respectively with a 22-ohm resistor. During normal operation, it acts as a normal GPIO pin.ĭ-/D+: These pins are Data Upstream Positive/Negative USB full-speed or low-speed ports. HWB: HWB is a special pin that allows the user to execute the bootloader. XATL: These pins are for the inverting oscillator amplifier and also for the input of internal clock operation. If the ADC is used, then it should be connected to VCC through a low-pass filter.ĪREF: This is the analog reference input pin for the ADC They don't work, the TX function on the master side doesn't seem to work, after serial monitor debugging is discovered the function never get over the. I'm working with Arduino boards with AVR C coding to perform simple SPI communication from master for simple blink application on slave side. If the ADC is not being used then it should be externally connected to VCC. Arduino nano & pro micro SPI simple communication.
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