PIC18F2455T-I/ML View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC18F2455T-I/ML

28/40/44-Pin, High-Performance, Enhanced Flash, USB Microcontrollers with nanoWatt Technology

Microchip Technology 

PIC18F2455/2550/4455/4550

FIGURE 25-7:

EXTERNAL BLOCK TABLE READ (EBTRx) DISALLOWED

Register Values

TBLPTR = 0008FFh

PC = 003FFEh

Program Memory

000000h

0007FFh

000800h

TBLRD*

001FFFh

002000h

003FFFh

004000h

Configuration Bit Settings

WRTB, EBTRB = 11

WRT0, EBTR0 = 10

WRT1, EBTR1 = 11

005FFFh

006000h

007FFFh

WRT2, EBTR2 = 11

WRT3, EBTR3 = 11

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

TABLAT register returns a value of ‘0’.

FIGURE 25-8:

EXTERNAL BLOCK TABLE READ (EBTRx) ALLOWED

Register Values

TBLPTR = 0008FFh

PC = 001FFEh

Program Memory

000000h

0007FFh

000800h

TBLRD*

001FFFh

002000h

003FFFh

004000h

005FFFh

006000h

007FFFh

Configuration Bit Settings

WRTB, EBTRB = 11

WRT0, EBTR0 = 10

WRT1, EBTR1 = 11

WRT2, EBTR2 = 11

WRT3, EBTR3 = 11

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

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

DS39632E-page 310

© 2009 Microchip Technology Inc.

Share Link: