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???
05/23/03 07:17
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#46456 - RE: Is there any bit addresable 8255?
Responding to: ???'s previous message
NO of course!!

8255 is an external device maped as a memory and the the only instructions aviable are movx @dptr,a and movx a,@dptr.
So if you need or want to use addreseable bit:
. Search a derivate with more IO ports
. Copy the registers of the 8255 in to the internal ram, read/modify the bits, write the registers again in the 8255.

List of 10 messages in thread
TopicAuthorDate
Is there any bit addresable 8255?            01/01/70 00:00      
   RE: Is there any bit addresable 8255?            01/01/70 00:00      
   RE: Is there any bit addresable 8255?            01/01/70 00:00      
   RE: Is there any bit addresable 8255?            01/01/70 00:00      
   RE: Is there any bit addresable 8255?            01/01/70 00:00      
   RE: Is there any bit addresable 8255?            01/01/70 00:00      
      RE: Is there any bit addresable 8255?            01/01/70 00:00      
   RE: Is there any bit addresable 8255?            01/01/70 00:00      
   RE: Is there any bit addresable 8255?            01/01/70 00:00      
      RE: Is there any bit addresable 8255?            01/01/70 00:00      

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