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???
10/21/10 02:29
Modified:
  10/21/10 02:41

Read: times


 
#179223 - I only use Atmel for 8051
Responding to: ???'s previous message
If you tried all suggestions including keeping ALE floating and using a 1K resistor on PSEN then you might have a go around with the errata. According to the errata:

3. FLASH - Frequence limitation for flash programming sequence. ..... minimum external frequency 7 MHz.
4. Crystal - Determine the correct capacitors on Xtal1 and Xtal2. .... we advise customer to look the application note "Analyzing the Behavior of an Oscillator and Ensuring Good startup"

You can find the errata here:

http://www.atmel.com/dyn/resou...oc7665.pdf

You can find the application note they ask the customer to look at here:

http://www.atmel.com/dyn/resou...oc4363.pdf

If you have additional problems perhaps upgrading FLIP to a newer version will work. If the problem still persists, make sure your hardware connections are accurate and according to Atmel's doc:

http://www.atmel.com/dyn/resou...ctions.pdf

Finally, you might have damaged your chip by not using the 1K and you might consider replacing it if you think there is nothing wrong with your hardware.

List of 10 messages in thread
TopicAuthorDate
Problem related to programing AT89c51RE2            01/01/70 00:00      
   Maybe a problem with your sequence            01/01/70 00:00      
      Lets Read That Again            01/01/70 00:00      
         You normally hold PSEN and then RESET            01/01/70 00:00      
         I knew about the 1k...            01/01/70 00:00      
   psen low, rst high before power applied            01/01/70 00:00      
      just curious            01/01/70 00:00      
         my mistake            01/01/70 00:00      
   Problem still is persisting            01/01/70 00:00      
      I only use Atmel for 8051            01/01/70 00:00      

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