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???
09/21/04 06:39
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 		 #77770 - RE: AT89S8252 ISP via SPI
Responding to: ???'s previous message
hi,

I prefer to use PonyProg for serial programming AT89S8252 and so have not used SP89. Anyway, here are my suggestions:

- check the reset level. MCU must be in reset state during serial downloading. It means, pin 9 should be provided with high level or VCC.
- pass the time before downloading for crystal freqence is stabilized.

- CLK frequency from PC must be less then OSC/40. Here it means: 276480Hz or less.

- CHECK Serial Programming Fuse. This fuse disables programming via SPI. It may be that you programmed this bit somehow with parallel programmer and serial downloading is not possible anymore. The Serial Programming Fuse can only be programmed or erased in the Parallel Programming Mode.

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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