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Forum Index : Microcontroller and PC projects : Microbridge Fault

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Mixtel90

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Joined: 05/10/2019
Location: United Kingdom
Posts: 6787
Posted: 10:49am 19 Sep 2023
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You used to have to erase the chip using HV programming mode to clear the flag (and the memory) so that it could be reprogrammed. I don't know if that applies to this particular chip.
Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs
 
JohnS
Guru

Joined: 18/11/2011
Location: United Kingdom
Posts: 3801
Posted: 12:54pm 19 Sep 2023
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  SteveIzett said  The Code Protection bit is set. Arrr.

No chance to compare it fully but you can do the things Rob put.

John
 
SteveIzett
Newbie

Joined: 04/05/2023
Location: Australia
Posts: 24
Posted: 02:32pm 19 Sep 2023
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I forgot to mention that the PicKit 3 reported when I tried reading the Pic16F1455 -
Warning: Debug bit is set on target image. This may not run correctly in production.
 
robert.rozee
Guru

Joined: 31/12/2012
Location: New Zealand
Posts: 2350
Posted: 06:18pm 19 Sep 2023
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i think you will also need to provide a power feed back into the 3v3 pad - as i recall i just used a couple of AA cells for this. hence the PicKit3 was set for 'externally powered target' in mplab.

the reason for needing the 2x AA cells is that you are also having to power the MX170, and combined with the 1455 the current draw exceeds what the PicKit3 can provide. alternatively, you may be able to temporarily tie pin 1 of the MX170 to ground so it is held in reset while the 1455 is being accessed, but i never tried this.


cheers,
rob   :-)
 
JohnS
Guru

Joined: 18/11/2011
Location: United Kingdom
Posts: 3801
Posted: 06:45pm 19 Sep 2023
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Good point!

PicKit3 is rubbish at providing power.

John
 
SteveIzett
Newbie

Joined: 04/05/2023
Location: Australia
Posts: 24
Posted: 09:31am 11 Feb 2024
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Hi Guys.
Sorry about the delay.
Silicon Chip sent me a replacement PIC1455 back in Sept last year and I finally got a moment to hack the old one out and replace with the new one. The Explorer28 burst into life. It appears it was an mis programmed Microbridge.
Thanks to all for the reflections and expertise.
Steve
 
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