PIC18F4580ISOSQTP View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC18F4580ISOSQTP

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

Microchip Technology 

PIC18F2480/2580/4480/4580

FIGURE 25-7:

EXTERNAL BLOCK TABLE READ (EBTRn) DISALLOWED

Register Values

Program Memory

Configuration Bit Settings

TBLPTR = 0008FFh

000000h

0007FFh

000800h

WRTB, EBTRB = 11

WRT0, EBTR0 = 10

PC = 007FFEh

TBLRD*

003FFFh

004000h

007FFFh

008000h

00BFFFh

00C000h

WRT1, EBTR1 = 11

WRT2, EBTR2 = 11

WRT3, EBTR3 = 11

00FFFFh

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

TABLAT register returns a value of ‘0’.

FIGURE 25-8:

EXTERNAL BLOCK TABLE READ (EBTRn) ALLOWED

Register Values

TBLPTR = 0008FFh

PC = 003FFEh

Program Memory

000000h

0007FFh

000800h

TBLRD*

003FFFh

004000h

007FFFh

008000h

00BFFFh

00C000h

00FFFFh

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 EBTRBn = 0.

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

© 2009 Microchip Technology Inc.

DS39637D-page 365

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