6800 is a parallel interface that uses Read/Write signal and an Enable signal to control the data bus.
Communications with a display are only enabled when the enable signal is pulled high.
The level of the Read/Write signal then determines whether data will be read from the display or written to the display. If the Read/Write signal is high, data will be read from the display whereas if the Read/Write signal is low, data will be written to the display.
Sometimes the Write will be shown as a “notted” signal. For instance, there may be a bar over the name, a preceding exclamation mark, slash, or dash. While this looks like negation notation, in this context it simply means the signal is active low.
Difference Between 6800 and 8080
The other common parallel interface is 8080 which uses separate read and write lines and no enable signal.
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