PIC18F258-I/SP View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC18F258-I/SP

28/40-Pin High-Performance, Enhanced Flash Microcontrollers with CAN Module

Microchip Technology 

PIC18FXX8

FIGURE 24-5:

EXTERNAL BLOCK TABLE READ (EBTRn) DISALLOWED

Register Values

TBLPTR = 000FFF

Program Memory

000000h

0001FFh

000200h

Configuration Bit Settings

WRTB, EBTRB = 11

WRT0, EBTR0 = 10

PC = 002FFE

TBLRD *

001FFFh

002000h

003FFFh

004000h

005FFFh

006000h

WRT1, EBTR1 = 11

WRT2, EBTR2 = 11

WRT3, EBTR3 = 11

007FFFh

Results: All table reads from external blocks to Blockn are disabled whenever EBTRn = 0.

TABLAT register returns a value of ‘0’.

FIGURE 24-6:

EXTERNAL BLOCK TABLE READ (EBTRn) ALLOWED

Register Values

Program Memory

000000h

0001FFh

000200h

Configuration Bit Settings

WRTB, EBTRB = 11

TBLPTR = 000FFF

WRT0, EBTR0 = 10

PC = 001FFE

TBLRD *

001FFFh

002000h

003FFFh

004000h

005FFFh

006000h

WRT1, EBTR1 = 11

WRT2, EBTR2 = 11

WRT3, EBTR3 = 11

007FFFh

Results: Table reads permitted within Blockn even when EBTRBn = 0.

TABLAT register returns the value of the data at the location TBLPTR.

DS41159E-page 278

© 2006 Microchip Technology Inc.

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