On 22 Nov 2004 22:41:06 GMT, the renowned cbarn24050@aol.com
(CBarn24050) wrote:

>>Subject: PIC12F629 improper operation, i.e., incorrect outputs
>>From: r.matsui@sbcglobal.net  (Richard Matsui)
>>Date: 22/11/2004 19:23 GMT Standard Time
>>Message-id: <e9128429.0411221123.d01a23@posting.google.com>
>>
>>Could my application have a problem of noise, i.e., transient
>>sensitivity?  Does having 100k or 200k to +5v on the inputs/outputs
>>reduce noise sensitivity?
>>Putting small capacitance to ground and/or high resistance on the
>>inputs/outputs to +5v help, except for the programming clock and data
>>and VPP. And reducing the clock frequency feeding the program counter.
>>
>>Richard Matsui
>
>Hard to say from the question, the most likely explanation is software bug.
>Next most likely is power supply quality.

Capacitive coupling to floating inputs maybe?  Hard to guess.. 

>Subject: PIC12F629 improper operation, i.e., incorrect outputs
>From: r.matsui@sbcglobal.net  (Richard Matsui)
>Date: 22/11/2004 19:23 GMT Standard Time
>Message-id: <e9128429.0411221123.d01a23@posting.google.com>
>
>Could my application have a problem of noise, i.e., transient
>sensitivity?  Does having 100k or 200k to +5v on the inputs/outputs
>reduce noise sensitivity?
>Putting small capacitance to ground and/or high resistance on the
>inputs/outputs to +5v help, except for the programming clock and data
>and VPP. And reducing the clock frequency feeding the program counter.
>
>Richard Matsui

Hard to say from the question, the most likely explanation is software bug.
Next most likely is power supply quality.

Could my application have a problem of noise, i.e., transient
sensitivity?  Does having 100k or 200k to +5v on the inputs/outputs
reduce noise sensitivity?
Putting small capacitance to ground and/or high resistance on the
inputs/outputs to +5v help, except for the programming clock and data
and VPP. And reducing the clock frequency feeding the program counter.

Richard Matsui