In the latter case the "shift register functionality" runs completely independent of the MCU core (after setup). arduino mega - Using SPI and 2 shift registers WITHOUT libraries - Arduino Stack. This can also be done by interrupt (TXEIE) or even using a DMA channel (TXDMAEN) with a circular buffer. Before start programming for SPI communication between two Arduinos. The MCU firmware needs to set up the SPI unit and then provide new data to the SPI unit, each time the Tx buffer empty flag (TXE) is set. Many parts use SPI for communications, so the Arduino offers simple. Since it is an independent hardware unit, it should be able to handle your 0.5us reaction time requirement. The 74HC595 shift register in your kit is an IC that has eight digital outputs. ![]() The SPI unit is highly configurable, e.g. Data frame format (data size can be set from 4-bit up to 16-bit length).So, at least 3 pins of UNO (MOSI, SCK, 1-DPin for RCK) would be required. Thanks for the nice textual description about the operation of the 74LS595 shift register. ![]() However, 1-DPin to G/ can be avoided by connecting G/-pin at GND potential.
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