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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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PIC18F4580-E/ML 데이터시트(PDF) 365 Page - Microchip Technology |
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PIC18F4580-E/ML 데이터시트(HTML) 365 Page - Microchip Technology |
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365 / 490 page  © 2009 Microchip Technology Inc. DS39637D-page 365 PIC18F2480/2580/4480/4580 FIGURE 25-7: EXTERNAL BLOCK TABLE READ (EBTRn) DISALLOWED FIGURE 25-8: 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 = 007FFEh 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 003FFFh 004000h 007FFFh 008000h 00BFFFh 00C000h 00FFFFh WRTB, EBTRB = 11 WRT0, EBTR0 = 10 WRT1, EBTR1 = 11 WRT2, EBTR2 = 11 WRT3, EBTR3 = 11 TBLRD* TBLPTR = 0008FFh PC = 003FFEh 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 003FFFh 004000h 007FFFh 008000h 00BFFFh 00C000h 00FFFFh |
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