PIC18F2682-I/PT MICROCHIP [Microchip Technology], PIC18F2682-I/PT Datasheet - Page 361

• Manufacturer Part Number: PIC18F2682-I/PT
• Description: 28/40/44-Pin Enhanced Flash Microcontrollers with ECAN Technology, 10-Bit A/D and nanoWatt Technology
• Manufacturer: MICROCHIP [Microchip Technology]

TABLE 24-3:
24.5.1
The program memory may be read to or written from
any location using the table read and table write
instructions. The Device ID may be read with table
reads. The Configuration registers may be read and
written with the table read and table write instructions.
In normal execution mode, the CPn bits have no direct
effect. CPn bits inhibit external reads and writes. A
block of user memory may be protected from table
writes if the WRTn Configuration bit is ‘0’. The EBTRn
bits control table reads. For a block of user memory
with the EBTRn bit set to ‘0’, a table read instruction
that executes from within that block is allowed to read.
© 2007 Microchip Technology Inc.
300008h
300009h
30000Ah
30000Bh
30000Ch
30000Dh
Legend: Shaded cells are unimplemented.
Note 1:
File Name
Unimplemented in PIC18F2682/4682 devices; maintain this bit set.
PROGRAM MEMORY
CODE PROTECTION
CONFIG5L
CONFIG5H
CONFIG6L
CONFIG6H
CONFIG7L
CONFIG7H
SUMMARY OF CODE PROTECTION REGISTERS
WRTD
Bit 7
CPD
—
—
—
—
EBTRB
WRTB
Bit 6
CPB
—
—
—
PIC18F2682/2685/4682/4685
EBTR5
Preliminary
WRT5
CP5
WRTC
Bit 5
—
—
(1)
(1)
(1)
EBTR4
WRT4
A table read instruction that executes from a location
outside of that block is not allowed to read and will
result in reading ‘0’s. Figures 24-6 through 24-8
illustrate table write and table read protection.
Bit 4
CP4
—
—
—
Note:
EBTR3
WRT3
Code protection bits may only be written to
a ‘0’ from a ‘1’ state. It is not possible to
write a ‘1’ to a bit in the ‘0’ state. Code
protection bits are only set to ‘1’ by a full
Chip Erase or Block Erase function. The
full Chip Erase and Block Erase functions
can only be initiated via ICSP or an
external programmer.
Bit 3
CP3
—
—
—
EBTR2
WRT2
Bit 2
CP2
—
—
—
EBTR1
WRT1
Bit 1
CP1
DS39761B-page 359
—
—
—
EBTR0
WRT0
Bit 0
CP0
—
—
—