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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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PIC18F4520E/MLQTP 데이터시트(PDF) 267 Page - Microchip Technology |
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PIC18F4520E/MLQTP 데이터시트(HTML) 267 Page - Microchip Technology |
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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’. Register Values 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 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. 000000h 0007FFh 000800h 001FFFh 002000h 003FFFh 004000h 005FFFh 006000h 007FFFh |
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