PIC12F675 datasheet(52/136 Pages) MICROCHIP

52 / 136 page

PIC12F629/675

DS41190G-page 52

 2010 Microchip Technology Inc.

8.7

Data EEPROM Operation During

Code Protect

Data memory can be code protected by programming

the CPD bit to ‘0’.

When the data memory is code protected, the CPU is

able to read and write data to the data EEPROM. It is

recommended to code protect the program memory

when code protecting data memory. This prevents

anyone from programming zeroes over the existing

code (which will execute as NOPs) to reach an added

routine, programmed in unused program memory,

which outputs the contents of data memory.

Programming unused locations to ‘0’ will also help

prevent data memory code protection from becoming

breached.

TABLE 8-1:

REGISTERS/BITS ASSOCIATED WITH DATA EEPROM

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Value on

POR, BOD

Value on all

other

Resets

0Ch

PIR1

EEIF

ADIF

—

CMIF

—

TMR1IF 00-- 0--0 00-- 0--0

9Ah

EEDATA

EEPROM Data Register

0000 0000 0000 0000

9Bh

EEADR

—

EEPROM Address Register

-000 0000 -000 0000

9Ch

EECON1

—

WRERR WREN

---- x000 ---- q000

9Dh

EECON2(1) EEPROM Control Register 2

---- ---- ---- ----

Legend: x = unknown, u = unchanged, - = unimplemented read as ‘

0’, q = value depends upon condition.

Shaded cells are not used by data EEPROM module.

Note 1: EECON2 is not a physical register.

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