> mattschinkel wrote:
>> I just think it is not good to connect ICSP VDD 5v to PSU 5v.
>> There could be a voltage difference, ICSP VDD may be 4.7v,
>> and PSU may be 5.2v. =A0Isn't this a bad idea?

You probably need to stop and take stock of the answers you are getting.
They can be summarised to something like:

- Sometimes it's OK.
- Sometimes there are special cases which make it OK.
- It's extremely context dependant and having the flexibility to
connect or not connect the two together depending on circumstance is a
really good idea [tm].

As I said:

> Try and think if there are conditions where you would find the
> connection was a bad idea.

You''ve done so. As intended.
No problem.

So.

> And then, even if you can't,

but you did, but regardless

> add two pins with a "shunt", so users can
> remove the connection if desired.

so you can connect or disconnect as desired.

As you can see that there are times when you may wish to interconnect
and others when you woulddn't and as yuou can work out which is which
withe the relevant datasheets etc, and as people have given you some
interesting comments on special cases, your original question seems to
have been well addressed.

No?

            Russell

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