RFPIC12F675K Datasheet, PDF (50/136 Pages) Microchip Technology – 20-Pin FLASH-Based 8-Bit CMOS Microcontroller with UHF ASK/FSK Transmitter

rfPIC12F675
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 WR
RD ---- 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.
DS70091A-page 48
Preliminary
 2003 Microchip Technology Inc.