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PIC18LF4331 Datasheet(PDF) 281 Page - Microchip Technology |
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PIC18LF4331 Datasheet(HTML) 281 Page - Microchip Technology |
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281 / 392 page  2010 Microchip Technology Inc. DS39616D-page 281 PIC18F2331/2431/4331/4431 FIGURE 23-7: EXTERNAL BLOCK TABLE READ (EBTRn) DISALLOWED FIGURE 23-8: EXTERNAL BLOCK TABLE READ (EBTRn) ALLOWED 000000h 0001FFh 000200h 0007FFh 000800h 000FFFh 001000h 0017FFh 001800h 001FFFh WRTB, EBTRB = 11 WRT0, EBTR0 = 10 WRT1, EBTR1 = 11 WRT2, EBTR2 = 11 WRT3, EBTR3 = 11 TBLRD * TBLPTR = 0002FFh PC = 000FFEh Results: All table reads from external blocks to Blockn are disabled whenever EBTRn = 0. The TABLAT register returns a value of ‘0’. Register Values Program Memory Configuration Bit Settings 000000h 0001FFh 000200h 0007FFh 000800h 000FFFh 001000h 0017FFh 001800h 001FFFh WRTB, EBTRB = 11 WRT0, EBTR0 = 10 WRT1, EBTR1 = 11 WRT2, EBTR2 = 11 WRT3, EBTR3 = 11 TBLRD * TBLPTR = 0002FFh PC = 0007FEh Register Values Program Memory Configuration Bit Settings Results: Table reads permitted within Blockn, even when EBTRBn = 0. The TABLAT register returns the value of the data at the location TBLPTR. |
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