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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PIC12F635E/ST датащи(PDF) 29 Page - Microchip Technology |
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PIC12F635E/ST датащи(HTML) 29 Page - Microchip Technology |
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29 / 196 page  © 2005 Microchip Technology Inc. Preliminary DS41232B-page 27 PIC12F635/PIC16F636/639 2.4 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 register. Any instruction using the INDF register actually accesses data pointed to by the File Select Register (FSR). Reading INDF itself indirectly will produce 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 and the IRP bit (STATUS<7>), as shown in Figure 2-6. A simple program to clear RAM location 20h-2Fh using indirect addressing is shown in Example 2-1. EXAMPLE 2-1: INDIRECT ADDRESSING FIGURE 2-6: DIRECT/INDIRECT ADDRESSING PIC12F635/PIC16F636/639 MOVLW 0x20 ;initialize pointer MOVWF FSR ;to RAM NEXT CLRF INDF ;clear INDF register INCF FSR ;INC POINTER BTFSS FSR,4 ;all done? GOTO NEXT ;no clear next CONTINUE ;yes continue Note: For memory map detail, see Figure 2-2. Data Memory Indirect Addressing Direct Addressing Bank Select Location Select RP1 RP0 6 0 From Opcode IRP File Select Register 7 0 Bank Select Location Select 00 01 10 11 180h 1FFh 00h 7Fh Bank 0 Bank 1 Bank 2 Bank 3 |
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