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'[PIC]: Programming 16F87X'
2001\06\17@104103 by =?iso-8859-1?Q?=C5ke_Neehr?=

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Hi !

In the directions for programming of
PIC16F87X from Microchip stands
following:

"To disable low voltage ICSP mode, the
LVP bit must be programmed to '0'.
This must be done while entered with
high voltage entry mode (LVP bit = 1).

Can anybody tell me what it really says
there and concrete, what I have to do
to get the programming working well??

Regards
ÅkeN

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2001\06\17@113009 by myke predko

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Hi ÅkeN,

What it is saying is that before you can take advantage of Low Voltage
programming, you have to first program the PICmicro (with a high programming
voltage - 12+ Volts) with the LVP bit reset.

Once this is done, you can program the part just using +5 Volts at _MCLR and
using RB3.

It's unfortunate that Microchip doesn't ship these parts from their factory
with the LVP bit reset so that people can take advantage of this.

myke
{Original Message removed}

2001\06\17@123657 by =?iso-8859-1?Q?=C5ke_Neehr?=

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----- Original Message ----- From: "myke predko" <spam_OUTmykeTakeThisOuTspamPASSPORT.CA>
To: <.....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU>
Sent: Sunday, June 17, 2001 5:27 PM
Subject: Re: [PIC]: Programming 16F87X


> Hi ÅkeN,
>
> What it is saying is that before you can take advantage of Low Voltage
> programming, you have to first program the PICmicro (with a high programming
> voltage - 12+ Volts) with the LVP bit reset.

So I have to programmed first _LVP_ON and then_LVP_OFF ? Do You mean so or??

{Quote hidden}

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2001\06\17@134208 by Byron A Jeff

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On Sun, Jun 17, 2001 at 06:32:02PM +0200, Åke Neehr wrote:
{Quote hidden}

Myke's interpretation is incorrect. Mchip DOES ship the parts with LVP set.
You can program them right out of the tube with low voltage.

What that statement actually states is that it required a high voltage
program sequence in order to disable LVP. Now this makes perfect sense. If
LVP can be disabled in a LVP programming sequence, then it would be possible
for a LVP programmer to disable a chip from LVP programming, leaving only HVP
programming as an option. However if a HVP programmer disables LVP, it's no
problem because that same HVP programmer can both program the chip, and can
reenable LVP at a later point in time.

To summarize:
- Chip is shipped with LVP on. It can be programmed in both LVP and HVP mode.
- A LVP programmer cannot disable LVP mode. Even if it attempts it, the bit
 will not be changed. I have a 16F87X LVP programmer and can verify this fact.
- A HVP programmer can disable/enable LVP mode. And only a HVP programmer can
 disable/enable LVP mode. Disable because the chip does not allow a LVP
 programmer to disable. Enable because if LVP is disabled, then only a HVP
 programmer can program the chip.


BAJ
{Quote hidden}

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2001\06\17@224619 by myke predko

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> > Hi ÅkeN,
> >
> > What it is saying is that before you can take advantage of Low Voltage
> > programming, you have to first program the PICmicro (with a high
programming
> > voltage - 12+ Volts) with the LVP bit reset.
>
> So I have to programmed first _LVP_ON and
> then_LVP_OFF ? Do You mean so or??

No.  You just have to program at high voltage to be able to change the
configuration fuse from _LVP_OFF to _LVP_ON.

Good luck,

myke

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2001\06\17@230927 by Bob Ammerman

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No!

From the factory chips come in LVP_ON mode.

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

{Original Message removed}

2001\06\17@234745 by myke predko

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Hi Bob,

I just opened up an unused tube and pulled one out a PIC16F877-04/P Date
Code 9939M10 and read the configuration fuses on my PSP:

Oscillator: XT
WDT: ON
PWRTE: OFF
CP: 1F00-1FFF
BODEN: ON
LVP: OFF
DATA EE Protect: OFF
Flash Program Write: OFF
Background Debug: Disabled

I know this isn't 0x03FFF, but it is representative of what I have seen with
the PIC16F87x parts.  Maybe I have older date codes but to get LVP working,
I have had to program PIC16F87x's with:

__CONFIG _CP_OFF & _DEBUG_OFF & _XT_OSC & _PWRTE_ON  & _WDT_OFF & _LVP_ON &
_WRT_ENABLE_ON & _BODEN_ON & _CPD_OFF

before I could use LVP.

myke

{Original Message removed}


'[PIC]: Programming 16F87X'
2002\05\16@075952 by Andreas Nyholm
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Hello.

I was using PIC some years ago, I did a project with a 16F84. Now I'm
thinking of making another project using a 16F87X. If I got
things right here, 16F87X is quite similar to 16F84 if you just think how
to make the programs?
I guess 16F87X is a good processor to use if I need a serial connection to
a computer and might need the A/D converter?
The most important question I got is: Are there any "easy to build"
programmers for 16F87X? Like there is for 16F84. I really would preciate
if I could build a cheap ICSP programmer.

Thanks in advance for your answers!

Andreas

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2002\05\16@081957 by andy n1yew

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Yes there is an easy programmer to build.

http://www.finitesite.com/d3jsys/

It uses LVP, but I made on with HVP, and they both work fine.. HVP is a
little bit harder to do, requires a transistors and a couple resistors and a
13 v supply.. also, I skipped using a voltage booster, and just put in a
small resistor in each line

andy n1yew

{Original Message removed}

2002\05\16@083333 by cuneyt bakan

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Hi,
http://www.jdm.homepage.dk/newpic.htm

This programmer for 16F84 but you can use it for
16F87X with a little modification. You need to adapt
memclr,programming clk and data,power and gnd pins to
16F87X.

--- Andreas Nyholm <spamBeGoneanyholmspamBeGonespamJYMY.KASE.FI> wrote:
{Quote hidden}

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2002\05\16@083539 by Raymond Mouthaan

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Try this: http://www.ucapps.de/howtoprog.html

Use IC-Prog software to program the device, it works fine with me.

Regards,

Ray
{Original Message removed}

2002\05\16@091536 by uter van ooijen & floortje hanneman

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> The most important question I got is: Are there any "easy to build"
> programmers for 16F87X? Like there is for 16F84. I really would preciate
> if I could build a cheap ICSP programmer.

If you can get someone to program a pic / do it yourself with a non-ICSP
programmer you could use a bootloader. For instance
http://www.voti.nl/wloader/n_index.html, the page contains links to other
bootloaders.

My first step in the pic-programmers-kits arena:
I have a few Wisp628 programmer 'beta' kits. The details about Wisp628
(and a link to the kit) can be found at http://www.xs4all.nl/wisp628. Both
pages are still somewhat under construction. The price is somewhat lower
than for the 'final' kit, OTOH the final kit will be a little bit different
(but fully compatible, to be exact: final kit will use a 2n2904 instead of a
bc547, there will be room for a 3-pin power header, and the 0.1uF C will be
placed better). Price of these 'beta' kits:
  dutchmen : 20 euro (incl BTW, giro 9036008)
  other EC-residents: $18 (incl VAT, paypal wouterEraseMEspam.....voti.nl)
  non-EC: $15 (no VAT, paypal EraseMEwouterspamvoti.nl)
If you are interested mail me.

And never forget to check techref/massmind:
http://www.piclist.com/techref/microchip/devprogs.htm

And recently seen on the piclist:
http://www.man.ac.uk/~mbhstdj/piclinks.html

Wouter van Ooijen
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Jal compiler, Wisp programmer, WLoader bootloader, PICs kopen

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