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???
05/02/09 06:36
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 		 #165000 - slave timing
Responding to: ???'s previous message
Richard,

Per's right. This is definitively a case for a microcontroller or two, sub-$1 each, and the two 74HCxx latches, $0nothing each.

Even if the master mcu won't check the busy flag of the module (which is never guaranteed if the master is a "black box"), the use of an other mcu or two allows not only to ensure absolutely correct timing for the slave display, but also allows to use anything other as the slave display: a graphic LCD, a LED dot matrix display (which may be a HUGE one if you want), a VFD (some of them are MUCH nicer than LCDs - OLED dot alphanum modules used to be even nicer, but unfortunately they are not made ever more) or even a PC with say an LCD projector...

Jan Waclawek

PS. 1602... in the last few months I went across quite a lot of 16x2 LCD modules and was writing and rewriting various related pieces of software, and as many manufacturers mark these modules as XXX1602YYY, I sort of get used to this notation... and use it in source file names, functions and variables names etc...

List of 24 messages in thread
TopicAuthorDate
How to read and redisplay from LCD databus?            01/01/70 00:00      
   Spy on the Data & Control lines            01/01/70 00:00      
      Can be hard to be fast enough            01/01/70 00:00      
   Shouldn't be a problem            01/01/70 00:00      
      some HW might be needed            01/01/70 00:00      
         Monitor the LCD databus then send via 485            01/01/70 00:00      
         I don't see a place for the 805x            01/01/70 00:00      
      Re: Shouldn't be a problem            01/01/70 00:00      
         some basic questions            01/01/70 00:00      
            Re:some basic questions            01/01/70 00:00      
               20 Meters            01/01/70 00:00      
                  Re: 20 Meters            01/01/70 00:00      
      Signal timing and command timing separate issues            01/01/70 00:00      
         Check the datasheet ...            01/01/70 00:00      
            Re: Check the datasheet ... and test on LCD of board B first            01/01/70 00:00      
               A CPLD at each end would do nicely            01/01/70 00:00      
                  Re: A CPLD at each end would do nicely            01/01/70 00:00      
                     it depends on requirements            01/01/70 00:00      
                        Watch out for assumptions about busy            01/01/70 00:00      
                           If that gets to be an issue ...            01/01/70 00:00      
                              slave timing            01/01/70 00:00      
                                 I doubt that will work.            01/01/70 00:00      
   I had done something like this in past            01/01/70 00:00      
      Re: I had done something like this in past            01/01/70 00:00      

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