PIC18F2682 Datasheet, PDF (362/484 Pages) Microchip Technology – 28/40/44-Pin Enhanced Flash Microcontrollers with ECAN Technology, 10-Bit A/D and nanoWatt Technology

PIC18F2682/2685/4682/4685
FIGURE 24-6:
TABLE WRITE (WRTn) DISALLOWED
Register Values
Program Memory
000000h
0007FFh
000800h
TBLPTR = 0008FFh
PC = 003FFEh
TBLWT*
003FFFh
004000h
PC = 00BFFEh
TBLWT*
007FFFh
008000h
00BFFFh
00C000h
00FFFFh
010000h
013FFFh
014000h
017FFFh
Results: All table writes disabled to Blockn whenever WRTn = 0.
Configuration Bit Settings
WRTB, EBTRB = 11
WRT0, EBTR0 = 01
WRT1, EBTR1 = 11
WRT2, EBTR2 = 11
WRT3, EBTR3 = 11
WRT4, EBTR3 = 11
WRT5, EBTR3 = 11
FIGURE 24-7:
EXTERNAL BLOCK TABLE READ (EBTRn) DISALLOWED
Register Values
TBLPTR = 0008FFh
Program Memory
000000h
0007FFh
000800h
Configuration Bit Settings
WRTB, EBTRB = 11
WRT0, EBTR0 = 01
PC = 007FFEh
TBLRD*
003FFFh
004000h
007FFFh
008000h
00BFFFh
00C000h
00FFFFh
010000h
013FFFh
014000h
017FFFh
WRT1, EBTR1 = 11
WRT2, EBTR2 = 11
WRT3, EBTR3 = 11
WRT4, EBTR3 = 11
WRT5, EBTR3 = 11
Results: All table reads from external blocks to Blockn are disabled whenever EBTRn = 0.
TABLAT register returns a value of ‘0’.
DS39761B-page 360
Preliminary
© 2007 Microchip Technology Inc.