On Tuesday 27 May 2003 15:16, Byron A Jeff scribbled:
> > I have never been able to use LVP for one reason ... the LVP pin is v=
ery
> > inconveniently located on RB3, since I use ICSP almost exclusively
> > nowadays.
>
> The LVP wasn't the issue. In fact I have a THVP design here:
>
> http://www.finitesite.com/d3jsys/proghvp.html

I've had one question w.r.t. most HVP ICSP's, and perhaps you might know =
=2E..=20
with the target PIC in-circuit, it's usually directly connected to it's o=
wn=20
on-board PS, usually a 7805.  So how is the programmer connected to the V=
dd=20
line?  A diode on the programmer Vdd line only protects the programmer wh=
en=20
the app circuit switches on.  I won't want to connect a diode permanently=
 in=20
the app-circuit's Vdd line for other reasons.  Is the programmer Vdd line=
=20
really piggybacked/paralleled with the app power?  I assume the app power=
=20
will be off right?  Most articles/docs on ICSP address issues with MCLR=20
connections, but not Vdd.

I notice however, that your design uses app-ckt power during programming,=
 and=20
does not control the Vdd line.  But how is the PIC reset during programmi=
ng? =20
I've tried with the Tait, and it does not work if I leave the app-ckt pow=
er=20
on only.


> I have an E-mail from one of my users with updated config strings. Let =
me
> post it here so you can use it for the 16F872 and the others.
>
> Thanks to Frederico Heinz for the update:
> ___________________________________________________________________
> diff -urN picprg2.3d/picprg.c picprg2.3d-fh/picprg.c
> --- picprg2.3d/picprg.c 2002-05-20 12:20:02.000000000 -0300
> +++ picprg2.3d-fh/picprg.c      2002-12-21 18:34:40.000000000 -0300
> @@ -156,6 +156,9 @@
>
>  dev_id_t pic_dev[] =3D
>  {{0x07c0,0x0fc0,0x0800,0x0080,0x10,"PIC16F628",pic16F628_config_string=
s},
> + {0x0960,0x0fe0,0x1000,0x0080,0x10,"PIC16F873",pic16F877_config_string=
s},
> + {0x0920,0x0fe0,0x1000,0x0080,0x10,"PIC16F874",pic16F877_config_string=
s},
> + {0x09e0,0x0fe0,0x2000,0x0100,0x10,"PIC16F876",pic16F877_config_string=
s},
>   {0x09a0,0x0fe0,0x2000,0x0100,0x10,"PIC16F877",pic16F877_config_string=
s},
>   {0x0560,0x0fe0,0x0400,0x0040,0x00,"PIC16F84A",pic16F84_config_strings=
},
>   {0x0000,0x0000,0x0000,0x0000,0x00,NULL}

Hey cool.  Thanks.

-Neil.

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