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???
07/20/07 05:21
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#142061 - Some problems
Responding to: ???'s previous message

The 6522/32 VIA uses the E as a clock source for the timers. At a pinch you could connect 8052 !WR to VIA R/!W then gate your select logic with !RD and !WR to get a high going E signal for the bus cycle. Then you'd need to analyse your setup and hold times to make sure both chips are happy. Personally, I'd be choosing a larger micro with the required amount of port pins or looking at other ways of implementing your i/o, say with i2c i/o expanders or serial shift registers/parallel latches etc.

BTW, I think the VIA is obsolete - I'm not sure who still makes it. I'd leave the 6522 along with the 8255 back in history.


List of 5 messages in thread
TopicAuthorDate
6800 peripherals on 8052            01/01/70 00:00      
   Some problems            01/01/70 00:00      
   What is it about the 6522 that you like?            01/01/70 00:00      
      Availability!            01/01/70 00:00      
         well ... maybe not so fast, but certainly useable            01/01/70 00:00      

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