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08/14/02 19:40
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#27254 - RE: ISP failure in Philips 89c51RD2 devices
Many thanks to Eric Malund for pointing out
the omission in AN461 regarding P2.6 .
So,is the following correct for hardware
boot loader execution:

On falling edge of reset:

PSEN is held low,
EA is held high (5v),
P2.6 AND P2.7 is held high,
ALE is held high (or not connected).

Did I miss anything?
Eric ,if you happen to read this I would
like a copy of your NoTouch document if
it's not too much trouble.My e-mail is
bassep@hotmail.com.

Thanks,
Phil Bassett.




List of 16 messages in thread
TopicAuthorDate
ISP failure in Philips 89c51RD2 devices            01/01/70 00:00      
RE: ISP failure in Philips 89c51RD2 devices            01/01/70 00:00      
RE: ISP failure in Philips 89c51RD2 devices            01/01/70 00:00      
RE: ISP failure in Philips 89c51RD2 devi            01/01/70 00:00      
RE: ISP failure in Philips 89c51RD2 devices            01/01/70 00:00      
RE: ISP failure in Philips 89c51RD2 devices            01/01/70 00:00      
RE: ISP failure in Philips 89c51RD2 devices            01/01/70 00:00      
RE: ISP failure in Philips 89c51RD2 devices            01/01/70 00:00      
RE: ISP failure in Philips 89c51RD2 devices            01/01/70 00:00      
RE: ISP failure in Philips 89c51RD2 devices            01/01/70 00:00      
RE: ISP failure in Philips 89c51RD2 devices            01/01/70 00:00      
RE: (Eric Malund) p 89c51RD2 devic            01/01/70 00:00      
RE: (Eric Malund) p 89c51RD2 devic            01/01/70 00:00      
RE: ISP failure in Philips 89c51RD2 devices            01/01/70 00:00      
RE: ISP failure in Philips 89c51RD2 devices            01/01/70 00:00      
RE: ISP failure in Philips 89c51RD2 devices            01/01/70 00:00      

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