Using factory made external Font ROM IC's with PBP ?

[CuriousOne]

Hello. There are several of special Font ROM IC's, which contain a lot of bitmap fonts. For example, GT21L16T1W contains ASCII letters in 5x7,7x8,6x12,8x16, as well as 12x12 and 16x16 pixel copies of arial font. Not to mention several thousands of greek, cyrillic, chinese and japanese fonts.
So using such IC should be a lot of memory saver for your products and reducing load to main CPU.

Anyone ever tried?

[Ioannis]

Interesting for GLCDs. Could not find any datasheet though.

Ioannis

[CuriousOne]

http://www.hobos.com.cn/upload/datasheet/GT21L16T1W.pdf

here it is. It also has support for a lot of unicode and even Farsi letters.

[Ioannis]

Thanks. Though in chinese...

Ioannis

[CuriousOne]

Well, actually, that is not that hard.
While I have no idea how to read Chinese
I learned and remembered meaning of certain hieroglyphs, so can get general idea about what is written there.

That datasheet contains nothing special, just says offsets for different characters and how they're mapped into rows and columns
forget to say, it also has complete set of pseudographics, so you can draw windows, some shapes, etc, using it.

You can use this list to see what characters are supported:

GB 2312 - Wikipedia (https://en.wikipedia.org/wiki/GB_2312)