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???
04/18/04 03:21
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#68707 - RE: 89C51RD2
Responding to: ???'s previous message
"OOPS if you are looking at ALE you had better have
EA low "

Not required.

I think you are confusing between PSEN and ALE.

This is what the Bible says:

When the CPU is executing from internal Program Memory, PSEN is
not activated, and program addresses are not emitted. However,
ALE continues to be activated twice per machine cycle and so it is
available as a clock output signal. Note, however, that one ALE is
skipped during the execution of the MOVX instruction.


Raghu


List of 7 messages in thread
TopicAuthorDate
89C51RD2            01/01/70 00:00      
   RE: 89C51RD2            01/01/70 00:00      
   RE: 89C51RD2            01/01/70 00:00      
      RE: 89C51RD2            01/01/70 00:00      
   RE: 89C51RD2            01/01/70 00:00      
      RE: 89C51RD2            01/01/70 00:00      
   RE: 89C51RD2            01/01/70 00:00      

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