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Re: [Usbpicprog-technical] PIC 16F628A
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From: Frans S. <fra...@gm...> - 2013-04-24 18:22:36
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Hello Nick,<br>
<br>
The voltage is on the low side. For this reason, in the new
schematic, D4 has been replaced by a 0R resistor (or a wire). Have
you also measured VDD?<br>
<br>
Kind regards,<br>
<br>
Frans Schreuder<br>
<br>
<div class="moz-cite-prefix">On 04/24/2013 07:54 PM, Nick wrote:<br>
</div>
<blockquote cite="mid:517...@gm..." type="cite">
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<div class="moz-cite-prefix">Hello Frans,<br>
<br>
I measured the voltage between VPP and GND using a multimeter in
the pic pins, it is 12.21V. I assume that this is not enough for
programing the 628A? <br>
<br>
On 24/4/2013 3:46 μμ, Frans Schreuder wrote:<br>
</div>
<blockquote cite="mid:517...@gm..." type="cite">
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<div class="moz-cite-prefix">The io_test function is good for an
indication, but not very accurate in voltage. Using a
multimeter is a better option.<br>
<br>
On 24-4-2013 13:58, ShadowCaster wrote:<br>
</div>
<blockquote
cite="mid:CAF...@ma..."
type="cite">
<div dir="ltr">Hello Frans,
<div><br>
</div>
<div>Thanks for your quick reply i'll double check the
voltages but i think that VPP is 11.4 to 12.3 when i try
the I/O test function in the software, i'll connect the
programmer with the pic and check with a multimeter and
the I/O test function.</div>
</div>
<div class="gmail_extra"><br>
<br>
<div class="gmail_quote">On Wed, Apr 24, 2013 at 2:26 PM,
Frans Schreuder <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:fra...@gm..." target="_blank">fra...@gm...</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<div>Dear Nick,<br>
<br>
The 16F628A PIC does work with the current software
/ firmware, although this pic is very selective when
it comes to operating voltages.<br>
Please verify that VDD > 4.5V and VPP >13V
with the pic connected.<br>
<br>
Regards,<br>
<br>
Frans
<div>
<div class="h5"><br>
<br>
On 24-4-2013 13:22, ShadowCaster wrote:<br>
</div>
</div>
</div>
<blockquote type="cite">
<div>
<div class="h5">
<div dir="ltr"><span
style="font-family:arial,sans-serif;font-size:13px">Hello,</span>
<div
style="font-family:arial,sans-serif;font-size:13px"><br>
</div>
<div
style="font-family:arial,sans-serif;font-size:13px">I
implemented the programmer based on the
designs and it works flawlessly with a PIC
18F2550 and a 18F1320. </div>
<div
style="font-family:arial,sans-serif;font-size:13px">The
thing is that i tried to program a 16F628A
that should be compatible, although it is
properly detected it doesn't write any data
to it. When i read it i get a repeated
pattern : FF 3F FF 3F.<br>
</div>
<div
style="font-family:arial,sans-serif;font-size:13px"><br>
</div>
<div
style="font-family:arial,sans-serif;font-size:13px">I
tried the same pic with a old serial
programmer and it is written without a
problem so it is not a pic problem</div>
<div
style="font-family:arial,sans-serif;font-size:13px"><br>
</div>
<div
style="font-family:arial,sans-serif;font-size:13px">I
tried both the latest stable as well as the
latest devel firmware/software. Is the
functionality for this model broken in the
latest versions? Can somebody verify?</div>
<div
style="font-family:arial,sans-serif;font-size:13px"><br>
</div>
<div
style="font-family:arial,sans-serif;font-size:13px">Regards</div>
<div
style="font-family:arial,sans-serif;font-size:13px">Nick</div>
</div>
<br>
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