Jan-Erik Soderholm,
Thank you for your reply.

> > Only crystal is connected with the header
>=20
> This is weird...
> See: http://ww1.microchip.com/downloads/en/DeviceDoc/51292R.pdf
>=20
> As far as I can see, the AC162053 doesn't have any place for a crystal.
I put the header to a breadboard and via breadboard I connected crystal wit=
h the header.

As far as I understand  ICD circuits consist  functionality of a particular=
 PIC circuit .

For example PIC16f648A - ICD consists functions of PIC16f648A .
And because PIC16f648A can/must  be connected with crystal( CLKIN and CLKOU=
T - pins=20
16 and 15) so I connected crystal to PIC16f648A - ICD too.


>=20
> I *think* that the header is useless without a target circuit.
But what is the smallest target circuit?I thought adding only crystal is OK=
 for starting=20
debugging=20
>=20
> It's called "*In* Circuit Debugging", not "Out Of Circuit Debugging"...
>=20

>=20
> Yes, quite sloopy descriptions from your part !
Sorry, I have just only  started with microchips  - so a lot  of new knowle=
dge for me to learn.

L.

>=20
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