PIC16F datasheet(29/40 Pages) MICROCHIP

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 2010 Microchip Technology Inc.

Advance Information

DS41390C-page 29

PIC16F/LF182X/PIC12F/LF1822

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 all ‘0’. Further programming is disabled for the

program memory (0000h-7FFFh).

Data memory is protected with its own code-protect bit

(CPD). When data code-protection is enabled (CPD = 0),

all data memory locations read as ‘0’. Further

programming is disabled for the data memory. Data

memory can still be programmed and read during

program execution.

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.

6.2

Data Memory

Data memory protection is enabled by programming

the CPD 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 on the PIC16F/LF182X and

PIC12F/LF1822. 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.

7.3

Data EEPROM

The programmer should be able to read data memory

information from a hex file and write data memory

contents to a hex file.

The physical address range of the 256 byte data

memory is 0000h-00FFh. However, these addresses

are logically mapped to address 1E000h-1E1FFh in the

hex file. This provides a way of differentiating between

the data and program memory locations in this range.

The format for data memory storage is one data byte

per address location, LSb aligned.

Note:

To ensure system security, if CPD bit = 0,

the Bulk Erase Program Memory command

will also erase data memory.

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