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???
09/21/04 05:59
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 		 #77768 - RE: AT89S8252 ISP via SPI
Responding to: ???'s previous message
hi,

3. Pull down resistor on pin 9 [ RESET ] of micro is missing. Unlike Philips Atmel micros don't have an internal pull down on reset.

They have. Here: page 31 of AT89S8252 datasheet indicates its value:
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RRST Reset Pull-down Resistor 50..300k
Regards,
Oleg



List of 26 messages in thread
TopicAuthorDate
AT89S8252 ISP via SPI            01/01/70 00:00      
   RE: AT89S8252 ISP via SPI            01/01/70 00:00      
      Alternative ISP software            01/01/70 00:00      
      RE: AT89S8252 ISP via SPI            01/01/70 00:00      
   RE: AT89S8252 ISP via SPI            01/01/70 00:00      
      RE: AT89S8252 ISP via SPI            01/01/70 00:00      
   RE: AT89S8252 ISP via SPI            01/01/70 00:00      
      RE: AT89S8252 ISP via SPI            01/01/70 00:00      
   RE: AT89S8252 ISP via SPI            01/01/70 00:00      
      Problem is on P1.6 (MISO)            01/01/70 00:00      
   RE: AT89S8252 ISP via SPI            01/01/70 00:00      
      RE: AT89S8252 ISP via SPI            01/01/70 00:00      
         Problem solved            01/01/70 00:00      
            Oops, credited wrong person            01/01/70 00:00      
   Correcting the SP89 schematic            01/01/70 00:00      
      Proven-Product Syndrome strikes again            01/01/70 00:00      
      RE: Correcting the SP89 schematic            01/01/70 00:00      
         RE: Correcting the SP89 schematic            01/01/70 00:00      
         RE: Correcting the SP89 schematic            01/01/70 00:00      
         RE: Correcting the SP89 schematic            01/01/70 00:00      
            RE: Correcting the SP89 schematic            01/01/70 00:00      
   Simplified and working schematic            01/01/70 00:00      
      RE: Simplified and working schematic            01/01/70 00:00      
         RE: Simplified and working schematic            01/01/70 00:00      
            RE: Simplified and working schematic            01/01/70 00:00      
               Working design            01/01/70 00:00      

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