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'lcd write times'
1996\12\06@055630 by Michael S. Hagberg

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just to clearify write times.

minimum times for signals are

Enable pulse width 450ns
Register select and read / write set up times 140ns
Data setup time 195ns

there is no maximum times for these signals.

but having programmed a few different lcd modules, i believe
the real question is how much time must pas between each byte
of data sent to the device.

the clear display command requires between 82us and 1.6ms

Return home 40us to 1.6ms

all other commands 40us

just a note about return home, i use the set CG ram address
to location zero, it only takes 40us.

michael

1996\12\06@062359 by Kalle Pihlajasaari

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Hi,

> Return home 40us to 1.6ms
>
> just a note about return home, i use the set CG ram address
> to location zero, it only takes 40us.

If the display has scrolled the two commands may behave differently.

Speculation but likely.

Cheers     *<<<-|
--
Kalle Pihlajasaari   spam_OUTkalleTakeThisOuTspamip.co.za   http://www.ip.co.za/ip
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+ 27 (11) 402-7750   Fax: 402-7751    http://www.ip.co.za/people/kalle

1996\12\06@104416 by myke predko

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>Hi,
>
>> Return home 40us to 1.6ms
>>
>> just a note about return home, i use the set CG ram address
>> to location zero, it only takes 40us.
>
>If the display has scrolled the two commands may behave differently.

Yes.  If you are going to do anything funky with an LCD (ie
scrolling/shifting the display), don't go by the 40usec/1.6msec
specifications - poll the Busy Flag (Bit 7 of the Instruction Port) of the
LCD.

I realize that this takes an extra pin (rather than just holding the R/W pin
at a constant value), and a bit of extra code (actually about the same
amount as a 160 usec dlay) but it will make sure everything works okay
without a *lot* of the messy debug that I went through before breaking down
and just putting it in when I was working with the LCDs.

Good luck,

myke

Today, the commercial sector is advancing computer and communication
technology at a breakneck pace.  In 1992, optical fiber was being installed
within the continental U.S. at rates approaching the speed of sound (if
computed as total miles of fiber divided by the number of seconds in the year).

Aviation Week and Space Technology, October 28, 1996

1996\12\06@191240 by Tony Matthews

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myke predko wrote:
{Quote hidden}

year).
>
> Aviation Week and Space Technology, October 28, 1996

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