I've been using the 4 bit configuration to connect my LCD, and it has performed as expected.What could I do if I connect it in 8 bit configuration that I can't do now? What would the other 4 pins get me?
The display starts up in 4-bit mode.
If you let it use 8 wires, it may sound like it will communicate faster, but I've heard experts here say there's no apparent improvement in speed.
So any speed gain going from 8-bit to 4-bit makes no practical gain for human eyes.
Makes sense... but why would virtually all display manufacturers waste so much effort to implement something that has so little payoff?
why would virtually all display manufacturers waste so much effort to implement something that has so little payoff?
14/16/18/24/32 bit parallel modes.
QuoteWhat would the other 4 pins get me?To give a meaningful answer, it is most likely necessary to know what specific LCD you are using.
What would the other 4 pins get me?
The display starts up in 4-bit mode. It uses 4 wires to communicate.
You do cut down the transmission time considerably in 8-bit mode: rather than presenting your data once in 8 bits, you now have to represent your data twice in 4 bits. That does speed up the time.
pulsing the enable line each take some small multiple of 67.5nS.
Quotepulsing the enable line each take some small multiple of 67.5nS. Not sure where that number comes from.
QuoteThe display starts up in 4-bit mode. It uses 4 wires to communicate.No and yes. The device actually starts up in 8-bit mode. Since it may actually be hooked up in a 4-bit system the first few instructions in the initialization sequence, the ones that are used to switch it out of the 8-bit mode if that is necessary, only require the use the of the upper four bits - the lower four bits are ignored even if they are hooked up.
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