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PICList Thread
'[PIC] : 16F628 configuration bits'
2001\06\01@030237 by Mias Van Vuuren

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Hello everybody

Could anybody give me a short summary of how the configuration bits for the
16f628 should be set up please. I am using  the same 4MHz crystal
configuration as with the 16F84. Furthermore, what is this low voltage
programming mode?

Thanks

Mias
*
Mias van Vuuren
e-mail : spam_OUTvanvuumTakeThisOuTspamvodacom.co.za <.....vanvuumKILLspamspam@spam@vodacom.co.za>

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2001\06\01@085223 by Byron A Jeff

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On Fri, Jun 01, 2001 at 07:59:02AM +0200, Mias Van Vuuren wrote:
> Hello everybody
>
> Could anybody give me a short summary of how the configuration bits for the
> 16f628 should be set up please.

I'm sure they're described in the datasheet. They way the config bits need
to be setup depends on your application. That's why they're configuration
bits.

Take a read of the datasheet for the part. Then if you have a specific
question. Post the information you know, and then the question.

But the above question is so vague that there's no useful answer.

Use the datasheet. That's what it's there for.

> I am using  the same 4MHz crystal
> configuration as with the 16F84. Furthermore, what is this low voltage
> programming mode?

LVP is when a separate programming pin is used for the part instead of
multiplexing MCLR with a high voltage (13V usually). This means that parts
can be programmed with only a 5V supply. This both simplifies programmers
and the ability to create in circuit programming systems.

I have a discussion about building a LVP programmer for the 16F87X series
using only a parallel port cable. You can find it in the archives here:

http://www.infosite.com/%7Ejkeyzer/piclist/2000/Mar/2126.html

Note that the login and the password are both the name of this list, in
lowercase.

I finally got around to building that programmer discussed. Works like a
champ. The only problem is that new parallel ports output 3.3V for high output.
While sufficient for TTL printers, it drives PICS (which are CMOS and want
over 4V for high output) crazy. So I ended up adding a single 74HCT573
octal latch that translates the 3.3V from the parallel port to 5V for the
PIC. Note that you must use HCT technology because they have TTL inputs and
CMOS outputs, which is exactly what we need for this application.

Anyway I hope this helps,

BAJ
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