| 전자부품 데이터시트 검색엔진 |
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PIC18F258-E/LSQTP 데이터시트(PDF) 280 Page - Microchip Technology |
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PIC18F258-E/LSQTP 데이터시트(HTML) 280 Page - Microchip Technology |
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280 / 402 page ![]() PIC18FXX8 DS41159E-page 278 © 2006 Microchip Technology Inc. FIGURE 24-5: EXTERNAL BLOCK TABLE READ (EBTRn) DISALLOWED FIGURE 24-6: EXTERNAL BLOCK TABLE READ (EBTRn) ALLOWED 000000h 0001FFh 000200h 001FFFh 002000h 003FFFh 004000h 005FFFh 006000h 007FFFh WRTB, EBTRB = 11 WRT0, EBTR0 = 10 WRT1, EBTR1 = 11 WRT2, EBTR2 = 11 WRT3, EBTR3 = 11 TBLRD * TBLPTR = 000FFF PC = 002FFE Results: All table reads from external blocks to Blockn are disabled whenever EBTRn = 0. TABLAT register returns a value of ‘0’. Register Values Program Memory Configuration Bit Settings 000000h 0001FFh 000200h 001FFFh 002000h 003FFFh 004000h 005FFFh 006000h 007FFFh WRTB, EBTRB = 11 WRT0, EBTR0 = 10 WRT1, EBTR1 = 11 WRT2, EBTR2 = 11 WRT3, EBTR3 = 11 TBLRD * TBLPTR = 000FFF PC = 001FFE Register Values 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. |
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