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???
04/04/01 04:09
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#10537 - Really unusual!!!!!
Hi! everyone

I'm trying to start with AT89C52 but I can't get it to work all I get is P1 all on 5 volts, all pins from P2 and P0 are showing a square wave with diferent frequecies my osscilator is running I can see it on the ALE and PSEN the EA is to vcc I have .1uf solid tamatalum capacitors bet. vcc and gnd also a 10 uf capacitor at my 5 volts regulator all I have is this and 10K pull-ups, my small test program is running ok on my debug.
The reset is done with 10k and 10uf diode and a push-b.
I tried diferent crystal but nothing change (6.144, 12, 24, 16 Mhz) I'm using 20pf capacitors ceramic.
My software only ini. stack, and writes 0FFH to all 3 ports and after a delay I try to write 01010101B but....
Also my programmer says the micro is good it programmed and verifies good, if anyone knows what could be wrong here please help me!!!!!

List of 17 messages in thread
TopicAuthorDate
Really unusual!!!!!            01/01/70 00:00      
RE: Really unusual!!!!!            01/01/70 00:00      
RE: Really unusual!!!!!            01/01/70 00:00      
RE: MY TEST PROGRAM...            01/01/70 00:00      
RE: Really unusual!!!!!            01/01/70 00:00      
RE: Really unusual!!!!!            01/01/70 00:00      
RE: Really unusual!!!!!            01/01/70 00:00      
RE: Really unusual!!!!!            01/01/70 00:00      
RE: Really unusual!!!!!            01/01/70 00:00      
RE: MY TEST PROGRAM...            01/01/70 00:00      
Keil: Windows vs. command line            01/01/70 00:00      
RE: Keil: Windows vs. command line            01/01/70 00:00      
RE: Keil: Windows vs. command line            01/01/70 00:00      
STILL NOT WORKING            01/01/70 00:00      
I've got it !!!!!!!!!!!!!!            01/01/70 00:00      
RE: Keil: Windows vs. command line            01/01/70 00:00      
RE: Keil: Windows vs. command line            01/01/70 00:00      

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