PIC16F676-ESLASHST datasheet(54/132 Pages) MICROCHIP

54 / 132 page

PIC16F630/676

DS40039F-page 54

 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 the data EEPROM module.

Note 1: EECON2 is not a physical register.

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