ON 20091012@3:26:42 PM at page:
On a web page you were interested in at:
http://www.massmind.org/techref/io/lcd/panel1.htm#40096.514224537
James Newton[JMN-EFP-786] Published and replied to post 40096.514224537 by pascor
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pascor@verizon.net asks:
Who is the manufacturer for *this* particular display and what is it's part number ??? I haven't been able to locate it elsewhere after many hours of web searching.
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This LCD module is a custom Phico model "M-0 9949 94V-0", which has long been out of production. It uses the original Hitachi HD4470 5V-only IC which has several minor design bugs, none of which are of much concern. It works fine in both 8-bit and 4-bit parallel data bus mode. Even with the newer HD44780U IC, don't expect to be able to read CGRAM and DDRAM. Hitachi blatantly neglected to provide proper documentation for RAM read timing even though they claim this can be done. However, there is really no need to read RAM, since the programmer is supposed to know what he wrote to RAM in the first place. Creating custom characters works fine, but Hitachi gives an incomplete character code chart, much like their HD44780(U) data sheet.
I have also have a complete AVR program that writes to the LCD and LEDs. I haven't tested the switch inputs yet, but that seems like a no-brainer. If anyone is interested in getting any of this corrected info then just let me know.
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