Hi Alan:

That is interesting - something I didn't know.
Per the data sheet for the 18F4620 series=20
(#39626b Par #23.1) they say that you write
to the Config Registers the same way you write
to EEPROM. It is a self-timed operation using
a TBLWT / TBLPTR=3DConfigReg# and it writes
1 byte at a time. =20

There is no mention of having  to use HVP to do this,=20
although when I program the chips (CfgRegs) I am=20
using HVP on the  EPIC-II programmer.

Apparently the 18Fs can program their own Config
Regs on the fly.

Roy

>The problem is that it can't write to the
>Configuration registers - just returns Error!
>with no explanation.  I am certain TINY could
>be fixed fairly easily, but the programming
>algorithm is in the Windows App, and I don't
>have the source for that part.

>>> You may be able to fix Tiny, but AFAIK all the 16F=20
>>>  parts require HVP mode to program the config register,=20
>>>  and I believe the same may be true for some, possibly=20
>>>  all 18F parts. dsPic 30F parts I cannot recall ever=20
>>>  hearing what happens here.

>>> Because HVP mode is required, you cannot use a=20
>>> bootloader to change the config register, on those parts=20
>>> where this mode is required.

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