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'16F84 question ( fuse protect )'
1998\07\15@091249 by Mercy

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Can anyone give me the answer to the following question :

If I understood properly, the main difference between 16C84 and 16F84,
apart from flash/eeprom, is the fact that the fuse protection bit is inverted.
Does this mean that programming for 16C84 with bit on is the same as
programming
for 16F84 with bit off ?

This question comes from my pic programmer software ( Forrest  electronics )
being a little old and supporting 16C84 but not 16F84. ( Sorry I can not
easily
do an upgrade )

1998\07\15@104156 by myke predko

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Hi Mercy,

>Can anyone give me the answer to the following question :
>
>If I understood properly, the main difference between 16C84 and 16F84,
>apart from flash/eeprom, is the fact that the fuse protection bit is inverted.
>Does this mean that programming for 16C84 with bit on is the same as
>programming
>for 16F84 with bit off ?

Yes.  You shouldn't have any problems as long as you remember to complement
the bit.

myke

This week in myke's Book Room: "The Night Crew" by John Sandford

http://www.myke.com/Book_Room

1998\07\15@111003 by Mike Keitz

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On Wed, 15 Jul 1998 15:10:42 +0200 Mercy <spam_OUTmercyTakeThisOuTspamGES.UNIV-MONTP2.FR>
writes:
>Can anyone give me the answer to the following question :
>
>If I understood properly, the main difference between 16C84 and 16F84,
>apart from flash/eeprom, is the fact that the fuse protection bit is
>inverted.
>Does this mean that programming for 16C84 with bit on is the same as
>programming
>for 16F84 with bit off ?

The bit which is inverted controls the Power-Up Timer.  In a majority of
applications, it doesn't matter whether this timer is used or not, so you
don't have to pay too much attention to setting the bit.

The 16F84 uses several bits to enable Code Protect, the C84 only one. A
programmer designed for 16F84 would be needed to properly enable the Code
Protect on one.

In summary, to use a 16C84 programmer to program a 16F84, set the
Power-up Timer opposite the way you want it, and leave Code Protect off.
Everything else is the same.



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1998\07\15@121822 by Thurman, Chuck

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yes, set the bit inverted for 16f84, works gud.......chuck

{Quote hidden}

1998\07\15@172652 by Sean Breheny

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Along this line of questioning...

A friend of mine recently asked me what the essential differences were
between the F84 and the C84. When I told him that the CP bit was
inverted, he asked if this would mean that the default setting had
changed, in other words, on a blank c84, the CP bit is set to off,
correct? Well, if on an F84, the empty device has all bits set high (as
in the C84), then shouldn't the CP bit be ON in a blank device?

Sean


On Wed, 15 Jul 1998, myke predko wrote:

{Quote hidden}

1998\07\16@040916 by Jim robertson

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At 17:25 15/07/98 -0400, you wrote:
>Along this line of questioning...
>
>A friend of mine recently asked me what the essential differences were
>between the F84 and the C84. When I told him that the CP bit was
>inverted, he asked if this would mean that the default setting had
>changed, in other words, on a blank c84, the CP bit is set to off,
>correct? Well, if on an F84, the empty device has all bits set high (as
>in the C84), then shouldn't the CP bit be ON in a blank device?
>
>Sean

The Code Protect bit is not inverted, it is the PWRTE bit that is.

Jim

>On Wed, 15 Jul 1998, myke predko wrote:
>
>> Hi Mercy,
>>
>> >Can anyone give me the answer to the following question :
>> >
>> >If I understood properly, the main difference between 16C84 and 16F84,
>> >apart from flash/eeprom, is the fact that the fuse protection bit is
inverted.
{Quote hidden}

1998\07\16@062411 by paulb

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Sean Breheny wrote:

> When I told him that the CP bit was inverted, he asked if this would
> mean that the default setting had changed, in other words, on a blank
> c84, the CP bit is set to off, correct? Well, if on an F84, the empty
> device has all bits set high (as in the C84), then shouldn't the CP
> bit be ON in a blank device?

 Default state of EEPROM memory the same, meaning of the bit (and it's
actually the Power-Up Timer Enable bit, not the code protect) is
inverted.  Forget it!  You'll almost never notice the difference.

--
 Cheers,
       Paul B.

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