Matthew Mucker wrote:
> Yes, R/W is tied low through a 1K resistor.
>
>   
>> -----Original Message-----
>> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
>> Behalf Of Jinx
>> Sent: Sunday, June 10, 2007 5:26 PM
>> To: Microcontroller discussion list - Public.
>> Subject: Re: [PIC] Interfacing to a Hitachi 44780 LCD in 4-bit mode
>>
>> Is R/W tied low ?
>>
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>
>   
I have projects running 4-bit as well as 8-bit and both work fine. If I 
recall, the timing is
a little off, and I use more than 130uS (usually a mS) in order to allow 
everything to settle.

Most of the time I use a 74HC595 to expand to 8-bit mode. For 3 pins I 
get 8. I simply
dump the 8-bit data first to the 595 than set up all the other stuff, 
then execute an e-strobe.
I am able to process an 80-bit write every 4mS except for special long 
waits.

--Bob
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