2012 Microchip Technology Inc. Preliminary DS41642A-page 21
PIC12LF1552
6.0 CODE PROTECTION
Code protection is controlled using the CP bit in
Configuration Word 1. When code protection is
enabled, all program memory locations (0000h-7FFFh)
read as ‘0’. Further programming is disabled for the
program memory (0000h-7FFFh).
The user ID locations and Configuration Words can be
programmed and read out regardless of the code
protection settings.
6.1 Program Memory
Code protection is enabled by programming the CP bit
in Configuration Word 1 register to ‘0’.
The only way to disable code protection is to use the
Bulk Erase Program Memory command.
7.0 HEX FILE USAGE
In the hex file there are two bytes per program word
stored in the Intel
®
INHX32 hex format. Data is stored
LSB first, MSB second. Because there are two bytes
per word, the addresses in the hex file are 2x the
address in program memory. (Example: Configuration
Word 1 is stored at 8007h. In the hex file this will be
referenced as 1000Eh-1000Fh).
7.1 Configuration Word
To allow portability of code, it is strongly recommended
that the programmer is able to read the Configuration
Words and user ID locations from the hex file. If the
Configuration Words information was not present in the
hex file, a simple warning message may be issued.
Similarly, while saving a hex file, Configuration Words
and user ID information should be included.
7.2 Device ID and Revision
If a device ID is present in the hex file at 1000Ch-
1000Dh (8006h on the part), the programmer should
verify the device ID (excluding the revision) against the
value read from the part. On a mismatch condition the
programmer should generate a warning message.
