Kalle Pihlajasaari wrote:
>
> Hi Michael, Tony,
>
> > > also is there a minimum clock speed for writing to an lcd module.
> >
> > yes, most lcd modules have a busy bit that can be read or a command
> > execution time of 40us for most commands and upto 200us for clear
> > display commands.
>
> Tony was asking about a minimum write speed.  You have described the
> maximum write speed limitations.
>
> The LCD displays are essentially static in I/O operation and you can
> write to it at any convenient speed as long as the rise times on the
> signals are reasonable.
Thanks Kalle
 You're correct I anticipate operating at a reduced clock speed for
several reasons and did not know if there were internal timing dohickeys
like the pic 84' uses to program it's own data eeprom "so I've read".

>
> There are minimum pulse widths that also cannot be exceeded which
> prevents direct connection to processor busses without wait states
> as well as the command execution limits Michael mentioned.
>
> Cheers
> --
> Kalle Pihlajasaari   kalle@ip.co.za   http://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