Datasheet

 2010-2012 Microchip Technology Inc. DS39977F-page 481
PIC18F66K80 FAMILY
FIGURE 28-8: EXTERNAL BLOCK TABLE READ (EBTRx) DISALLOWED
FIGURE 28-9: EXTERNAL BLOCK TABLE READ (EBTRx) ALLOWED
WRTB, EBTRB = 11
WRT0, EBTR0 = 10
WRT1, EBTR1 = 11
WRT2, EBTR2 = 11
WRT3, EBTR3 = 11
TBLRD*
TBLPTR = 0008FFh
PC = 007FFEh
Results: All table reads from external blocks to Blockn are disabled whenever EBTRx = 0.
The TABLAT register returns a value of ‘
0’.
Register Values Program Memory Configuration Bit Settings
000000h
0007FFh
000800h
003FFFh
004000h
007FFFh
008000h
00BFFFh
00C000h
00FFFFh
WRTB, EBTRB = 11
WRT0, EBTR0 = 10
WRT1, EBTR1 = 11
WRT2, EBTR2 = 11
WRT3, EBTR3 = 11
TBLRD*
TBLPTR = 0008FFh
PC = 003FFEh
Register Values Program Memory Configuration Bit Settings
Results:
Table reads are permitted within Blockn, even when EBTRBx = 0.
The TABLAT register returns the value of the data at the location, TBLPTR.
000000h
0007FFh
000800h
003FFFh
004000h
007FFFh
008000h
00BFFFh
00C000h
00FFFFh