PIC18F4520ESLASHMLQTP datasheet(267/390 Pages) MICROCHIP

Part #	PIC18F4520E/MLQTP

Description	28/40/44-Pin Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

PDF	390 Pages

Scroll/Zoom	100%

Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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267 / 390 page

 2004 Microchip Technology Inc.

Preliminary

DS39631A-page 265

PIC18F2420/2520/4420/4520

FIGURE 23-7:

EXTERNAL BLOCK TABLE READ (EBTRn) DISALLOWED

FIGURE 23-8:

EXTERNAL BLOCK TABLE READ (EBTRn) ALLOWED

WRTB, EBTRB = 11

WRT0, EBTR0 = 10

WRT1, EBTR1 = 11

WRT2, EBTR2 = 11

WRT3, EBTR3 = 11

TBLRD*

TBLPTR = 0008FFh

PC = 003FFEh

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

TABLAT register returns a value of ‘0’.

Program Memory

Configuration Bit Settings

000000h

0007FFh

000800h

001FFFh

002000h

003FFFh

004000h

005FFFh

006000h

007FFFh

WRTB, EBTRB = 11

WRT0, EBTR0 = 10

WRT1, EBTR1 = 11

WRT2, EBTR2 = 11

WRT3, EBTR3 = 11

TBLRD*

TBLPTR = 0008FFh

PC = 001FFEh

Program Memory

Configuration Bit Settings

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

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

000000h

0007FFh

000800h

001FFFh

002000h

003FFFh

004000h

005FFFh

006000h

007FFFh

PIC18F4520E/MLQTP Datasheet(PDF) 267 Page - Microchip Technology

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