In SX Microcontrollers, SX/B Compiler and SX-Key Tool, g_daubach wrote:

Nick,

in my application, I designed the 16 pot units as well as the 64 pushbutton/LED units and others as I²C masters, tied together in a multi-master I²C bus system, i.e. each unit can handle bus arbitration situations, and will try to re-send pending change information in case it lost bus arbitration. With this configuration, there is no need for the "super master" to constantly check for individual changes. Instead, when a pot unit detects a pot change, it sends a message to the "super master". Similarly, the pushbutton units send a message when a button-down, or button-up event has been detected. Besides this, the "super master" can also request states from all units in order to initialize the whole system after a power-on.

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