I came across an I2C article which lead me to a question. Specifically this part is creating some confusion:
"Also, unlike SPI, I2C can support a multi-master system, allowing more than one master to communicate with all devices on the bus (although the master devices can’t talk to each other over the bus and must take turns using the bus lines)" Sparkfun
Why can't masters talk to each other in a I2C bus if you supposedly have an unique address bit for each of the devices connected to it?
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