PIC18LF4420T-I/SO 데이터 시트보기 (PDF) - Microchip Technology

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PIC18LF4420T-I/SO

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

Microchip Technology 

PIC18F2420/2520/4420/4520

FIGURE 23-7:

EXTERNAL BLOCK TABLE READ (EBTRn) DISALLOWED

Register Values

TBLPTR = 0008FFh

Program Memory

000000h

0007FFh

000800h

Configuration Bit Settings

WRTB, EBTRB = 11

WRT0, EBTR0 = 10

PC = 003FFEh

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 23-8:

EXTERNAL BLOCK TABLE READ (EBTRn) ALLOWED

Register Values

Program Memory

000000h

0007FFh

000800h

Configuration Bit Settings

WRTB, EBTRB = 11

TBLPTR = 0008FFh

WRT0, EBTR0 = 10

PC = 001FFEh

TBLRD*

001FFFh

002000h

003FFFh

004000h

005FFFh

006000h

007FFFh

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.

 2004 Microchip Technology Inc.

Preliminary

DS39631A-page 265

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