'lcd write times'
Michael S. Hagberg
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.
> 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.
Kalle Pihlajasaari ip.co.za kallehttp://www.ip.co.za/ip
Interface Products P O Box 15775, DOORNFONTEIN, 2028, South Africa
+ 27 (11) 402-7750 Fax: 402-7751 http://www.ip.co.za/people/kalle
>> 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
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.
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
myke predko wrote:
> Aviation Week and Space Technology, October 28, 1996
More... (looser matching)
- Last day of these posts
- In 1996
, 1997 only
- New search...