I have an Ebay HD44780 LCD equipped with a piggybacked PCF8574 expander chip. I have been able to make it work in 4-bit mode thanks to many of the related threads on this forum. Unfortunately 4-bit mode requires some awkward programming every time you display a message.
So my question is, why does everyone seem to operate this board in 4-bit mode? It is advertised a 4-bit or 8-bit and by examining the connections to the display it appears that all eight bits are interconnected. So it seems like 8-bit mode should be feasible and yet 4-bit mode seems to be the common implementation.
I have done some Googling and I have not found an answer to this question...anybody have some insight before I spin my wheels trying to implement 8-bit mode?
Thanks,
Frank
So my question is, why does everyone seem to operate this board in 4-bit mode? It is advertised a 4-bit or 8-bit and by examining the connections to the display it appears that all eight bits are interconnected. So it seems like 8-bit mode should be feasible and yet 4-bit mode seems to be the common implementation.
I have done some Googling and I have not found an answer to this question...anybody have some insight before I spin my wheels trying to implement 8-bit mode?
Thanks,
Frank