Re: LCD drivers

On Friday, in article <11jppu5dhvrg53e@xxxxxxxxxxxxxxxxxx>
delman@xxxxxxxxxxxxxxx "Howard Delman" wrote:
>I am considering using an MCU that has built in LCD drivers, but it only
>implements 1:8 multiplexing. In other words, it has eight "common"
>lines that are sequentially asserted. I need to connect it to an eight
>character seven segment display. None of the displays that I have found
>are designed for 1:8 multiplexing. Is it possible, and reasonable, to
>use this MCU with a display that only has four commons (1:4
>multiplexing)?

To drive 8 characters with four commons suggests more segment drives required
in other words the common drives TWO characters at the same time, so requires
*14* segment drives (16 including DP).

Does the micro support sufficient segment drives to match the LCD.

> If so, would I use four consecutive commons, or every
>other one? Would the appearance suffer in any way? And what if the
>display is 1:3?

The micro probably has the ability to drive UPTO 8 common drives and
upto SOME number of segment drives, you must match this to your LCD
and vice versa.

The information should be in the micrprocessor and LCD datasheets and/or
application notes.

As you have not said WHICH micro and WHICH display you are using, no more
detailed help can be given.

>Thanks for any help.
>Howard Delman

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