PIC18F6X2X Datasheet, PDF (277/386 Pages) Microchip Technology – 64/80-Pin High Performance, 64-Kbyte Enhanced FLASH Microcontrollers with A/D

PIC18F6X2X/8X2X
FIGURE 24-5:
EXTERNAL BLOCK TABLE READ (EBTRn) DISALLOWED
Register Values
TBLPTR = 000FFFh
PC = 004FFEh
Program Memory
000000h
0007FFh
000800h
TBLRD*
003FFFh
004000h
Configuration Bit Settings
WRTB,EBTRB = 11
WRT0,EBTR0 = 10
WRT1,EBTR1 = 11
007FFFh
008000h
WRT2,EBTR2 = 11
00BFFFh
00C000h
WRT3,EBTR3 = 11
00FFFFh
Results: All table reads from external blocks to Block n are disabled whenever EBTRn = 0.
TABLAT register returns a value of ‘0’.
FIGURE 24-6:
EXTERNAL BLOCK TABLE READ (EBTRn) ALLOWED
Register Values
TBLPTR = 000FFFh
PC = 003FFEh
Program Memory
000000h
0007FFh
000800h
TBLRD*
003FFFh
004000h
Configuration Bit Settings
WRTB,EBTRB = 11
WRT0,EBTR0 = 10
007FFFh
008000h
WRT1,EBTR1 = 11
WRT2,EBTR2 = 11
00BFFFh
00C000h
WRT3,EBTR3 = 11
00FFFFh
Results: Table reads permitted within Block n, even when EBTRBn = 0.
TABLAT register returns the value of the data at the location TBLPTR.
 2003 Microchip Technology Inc.
Advance Information
DS39612A-page 275