
2001 Microchip Technology Inc.
Advance Information
DS39582A-page 37
PIC16F87XA
3.7
Protection Against Spurious Write
There are conditions when the device should not write
to the data EEPROM or FLASH program memory. To
protect against spurious writes, various mechanisms
have been built-in. On power-up, WREN is cleared.
Also, the Power-up Timer (72 ms duration) prevents an
EEPROM write.
The write initiate sequence and the WREN bit together
help prevent an accidental write during brown-out,
power glitch, or software malfunction.
3.8
Operation During Code Protect
When the data EEPROM is code protected, the micro-
controller can read and write to the EEPROM normally.
However, all external access to the EEPROM is dis-
abled. External write access to the program memory is
also disabled.
When program memory is code protected, the micro-
controller can read and write to program memory nor-
mally, as well as execute instructions. Writes by the
device may be selectively inhibited to regions of the
memory, depending on the setting of bits WR1:WR0 of
the configuration word (see Section 14.1 for additional
information). External access to the memory is also
disabled.
TABLE 3-1:
REGISTERS/BITS ASSOCIATED WITH DATA EEPROM
AND FLASH PROGRAM MEMORIES
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
Power-on
Reset
Value on
all other
RESETS
10Ch
EEDATA
EEPROM/FLASH Data Register Low Byte
xxxx xxxx uuuu uuuu
10Dh
EEADR
EEPROM/FLASH Address Register Low Byte
xxxx xxxx uuuu uuuu
10Eh
EEDATH
—
—
EEPROM/FLASH Data Register High Byte
xxxx xxxx ---0 q000
10Fh
EEADRH
—
—
—
EEPROM/FLASH Address Register High Byte
xxxx xxxx ---- ----
18Ch
EECON1
EEPGD
—
—
—
WRERR
WREN
WR
RD
x--- x000 ---0 q000
18Dh
EECON2
EEPROM Control Register2 (not a physical register)
---- ---- ---- ----
0Dh
PIR2
—
CMIF
—
EEIF
BCLIF
—
—
CCP2IF
-0-0 0--0 -0-0 0--0
8Dh
PIE2
—
CMIE
—
EEIE
BCLIE
—
—
CCP2IE
-0-0 0--0 -0-0 0--0
Legend:
x
= unknown,
u
= unchanged,
-
= unimplemented, read as '0',
q
= value depends upon condition.
Shaded cells are not used by Data EEPROM or FLASH Program Memory.