See page 35 of the pdf manual D40139B

7.10 Program Verification/Code Protection

If the code protection bit has not been programmed,
the on-chip program memory can be read out for
verification purposes.

The first 64 locations can be read regardless of the
code protection bit setting.

michael


-----Original Message-----
From: Gavin Jackson <vulcan@IHUG.CO.NZ>
To: PICLIST@MITVMA.MIT.EDU <PICLIST@MITVMA.MIT.EDU>
Date: Wednesday, March 25, 1998 5:08 PM
Subject: 12C508 Code Protection


>Hi there
>
>I would just like someone to explain
>just what the code protection bits
>protect.
>
>I have just 'burnt' a OTP 12C508 and
>enabled code protection. The things
>is, I can still read my program from the
>chip. The program only occupies the first
>63 bytes.
>
>Is the whole EPROM code protected or
>just a part of it. When I read back my program
>I get a warning that tell me the device is
>code protected.
>
>The PDF file on the chip doesn't have a thing
>on the code protection.
>
>Regards
>
>Gavin
>--------------------------
>vulcan@ihug.co.nz
>http://www.geocities.com/TheTropics/Cabana/2625
>--------------------------
>