This is a multi-part message in MIME format.

------_=_NextPart_001_01C2662C.8B41E6B1
Content-Type: text/plain;
        charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable


>IMHO 200k is too high and will make the MCLR pin susceptible to noise
>spikes. As a rule I like to keep any input impedances below 10k max,
>for most environments, and at that keep associated tracks short.=20

From the Microchip Midrange Reference Manual, DS33023A:

Page 3-4, Acrobat page 56 states..

"Just tie the MCLR pin directly (or through a resistor) to VDD as=20
shown in Figure 3-2."


Since a resistor (or some other isolation) is necessary for reset=20
buttons and/or ICSP, A note included in Figure 3-3 goes on with..

"R < 40K is recommended to ensure that the voltage drop
across R does not exceed 0.2V. A larger voltage drop will
degrade Vih level on the MCLR/VPP pin."


Please note: These Quotes are out of context, as I'm too lazy
to copy and paste the entire section of the manual. Also, there
was no mention of the particular PIC in question. This is from the
Midrange reference manual, though I have seen
similar references in the PIC18Fxx8 reference manual.

A link to the midrange reference manual is below.

Lyle

------_=_NextPart_001_01C2662C.8B41E6B1
Content-Type: application/octet-stream;
        name="33023a.pdf.url"
Content-Transfer-Encoding: base64
Content-Description: 33023a.pdf.url
Content-Disposition: attachment;
        filename="33023a.pdf.url"

W0ludGVybmV0U2hvcnRjdXRdDQpVUkw9aHR0cDovL3d3dy5taWNyb2NoaXAuY29tL2Rvd25sb2Fk
L2xpdC9zdXBwZG9jL3JlZmVybmNlL21pZHJhbmdlLzMzMDIzYS5wZGYNCk1vZGlmaWVkPUQwNTEy
ODBGMkM2NkMyMDFBRA0K

------_=_NextPart_001_01C2662C.8B41E6B1--

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body