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projects:hi-pi [2017/03/21 04:54] – [Hi-Pi high voltage PIC programmer] darronprojects:hi-pi [2017/03/23 05:34] (current) – [Appendix] darron
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 === News === === News ===
  
-A bug may occur with this circuit in some situations, please refer to the+A bug may occur with this circuit in certain situations, please refer to the
 appendix. appendix.
  
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 === Appendix === === Appendix ===
  
-Thanks must go to Tomas Lorenc who has notified me that on some PICMicros with +Thanks must go to Tomas Lorenc who has notified me a fix is required 
-certain configuration bit settings hi-pi will fail +for devices which have MCLR configured as an I/O. In this situation 
-to bring a device out of reset and into programming mode due to VDD +a device is not brought out of reset and into programming mode due to VDD 
-being presented first. Here he presents a fix for this situation.+being raised first. Here he presents a fix for this situation.
  
 {{:projects:hi-pi-mod.png?200}} {{:projects:hi-pi-mod.png?200}}
 +
 +For example, the PIC12F675 has this feature in it's configuration word.
 +
 +<code>
 +bit5
 +MCLRE: GP3/MCLR Pin Function Select bit(5)
 +1 = GP3/MCLR pin function is MCLR
 +0 = GP3/MCLR pin function is digital I/O, MCLR internally tied to VDD
 +</code>
 +