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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PIC876 датащи(PDF) 29 Page - Microchip Technology |
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PIC876 датащи(HTML) 29 Page - Microchip Technology |
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29 / 218 page  2001 Microchip Technology Inc. DS30292C-page 27 PIC16F87X 2.5 Indirect Addressing, INDF and FSR Registers The INDF register is not a physical register. Addressing the INDF register will cause indirect addressing. Indirect addressing is possible by using the INDF reg- ister. Any instruction using the INDF register actually accesses the register pointed to by the File Select Reg- ister, FSR. Reading the INDF register itself, indirectly (FSR = ’0’) will read 00h. Writing to the INDF register indirectly results in a no operation (although status bits may be affected). An effective 9-bit address is obtained by concatenating the 8-bit FSR register and the IRP bit (STATUS<7>), as shown in Figure 2-6. A simple program to clear RAM locations 20h-2Fh using indirect addressing is shown in Example 2-2. EXAMPLE 2-2: INDIRECT ADDRESSING FIGURE 2-6: DIRECT/INDIRECT ADDRESSING MOVLW 0x20 ;initialize pointer MOVWF FSR ;to RAM NEXT CLRF INDF ;clear INDF register INCF FSR,F ;inc pointer BTFSS FSR,4 ;all done? GOTO NEXT ;no clear next CONTINUE : ;yes continue Note 1: For register file map detail, see Figure 2-3. Data Memory(1) Indirect Addressing Direct Addressing Bank Select Location Select RP1:RP0 6 0 From Opcode IRP FSR register 7 0 Bank Select Location Select 00 01 10 11 Bank 0 Bank 1 Bank 2 Bank 3 FFh 80h 7Fh 00h 17Fh 100h 1FFh 180h |
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