PIC18F2510 MICROCHIP [Microchip Technology], PIC18F2510 Datasheet - Page 255
PIC18F2510
Manufacturer Part Number
PIC18F2510
Description
28/40/44-PIN FLASH MICROCONTROLLERS WITH 10-BIT A/D AND NANO WATT TECHNOLOGY
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18F2510.pdf
(380 pages)
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22.5.1
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. 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. A table read instruction that executes
FIGURE 22-7:
2004 Microchip Technology Inc.
Results: All table reads from external blocks to Blockn are disabled whenever EBTRn = 0.
TBLPTR = 0008FFh
PROGRAM MEMORY
CODE PROTECTION
Register Values
PC = 003FFEh
TABLAT register returns a value of ‘0’.
EXTERNAL BLOCK TABLE READ (EBTRn) DISALLOWED
(16-KBYTE AND 32-KBYTE DEVICES)
Program Memory
Preliminary
TBLRD*
from a location outside of that block is not allowed to
read and will result in reading ‘0’s. Figures 22-7
through 22-10 illustrate table write and table read
protection.
Note:
000000h
0007FFh
000800h
001FFFh
002000h
003FFFh
004000h
005FFFh
006000h
007FFFh
PIC18F2X1X/4X1X
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.
Configuration Bit Settings
WRT1, EBTR1 = 11
WRT2, EBTR2 = 11
WRT3, EBTR3 = 11
WRTB, EBTRB = 11
WRT0, EBTR0 = 10
DS39636A-page 253
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