At 08:50 PM 09/12/2011, you wrote:
>Just for reference:
>
>I finally get a spare moment around this place to try some code out a frie=
nd
>has been working on with a 18F14K22 and when I loaded the project and hook
>up my ICD2 with the $50 (!!!!) AC244033 adapter, it pops up a warning
>message:
>
>"ICDWarn0068: This device has a VPP(max) below the minimum ICD2 VPP level =
of
>12V. Please ensure that external protection for MCLR is in place (Press th=
e
>Help button for an example circuit or use AC164112 available from
>microchipDIRECT.com)"

Nice that they warn you, I suppose, instead of refusing to try to
program or killing the chip.

>A little searching finds:
>http://www.microchip.com/forums/tm.aspx?m=3D409832 Yep=85 the ICD2 will ki=
ll a
>14k22 and also:
>
>PIC16F727  Family
>PIC16F1937 Family
>
>PIC18F14K22 Family
>PIC18F14K50 Family
>PIC18F46K20 Family
>PIC24F16KA102 Family

PIC18F2xK22 too, as it turns out.

>so I have to modify the board I'm using or put out another $10 to make it
>compatible
>http://www.microchipdirect.com/productsearch.aspx?Keywords=3DAC164112
>http://parts.digikey.com/1/parts/1583015-voltage-limiter-mplab-icd2-vpp-ac=
16
>4112.html

Pretty easy to make up an adapter in a few minutes with junk box parts..
three resistors (10K/24K/270) and a TL431. Not that $10 isn't quite
reasonable.

If you don't have a TL431 lying around.. look in any failed PC power supply
you might have around, and there is probably one hiding in there.

Last time I needed it, I happened to have some 8.5V zener diodes around,
which seemed to do well enough for development work with 270R as the
series resistor).

--sp



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