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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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PIC18F242 데이터시트(PDF) 211 Page - Microchip Technology |
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PIC18F242 데이터시트(HTML) 211 Page - Microchip Technology |
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211 / 332 page  © 2006 Microchip Technology Inc. DS39564C-page 209 PIC18FXX2 FIGURE 19-5: EXTERNAL BLOCK TABLE READ (EBTRn) DISALLOWED FIGURE 19-6: 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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