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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PIC16LC71 датащи(PDF) 24 Page - Microchip Technology |
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PIC16LC71 датащи(HTML) 24 Page - Microchip Technology |
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24 / 176 page  PIC16C71X DS30272A-page 24 © 1997 Microchip Technology Inc. Example 4-1 shows the calling of a subroutine in page 1 of the program memory. This example assumes that PCLATH is saved and restored by the interrupt ser- vice routine (if interrupts are used). EXAMPLE 4-1: CALL OF A SUBROUTINE IN PAGE 1 FROM PAGE 0 ORG 0x500 BSF PCLATH,3 ;Select page 1 (800h-FFFh) BCF PCLATH,4 ;Only on >4K devices CALL SUB1_P1 ;Call subroutine in : ;page 1 (800h-FFFh) : : ORG 0x900 SUB1_P1: ;called subroutine : ;page 1 (800h-FFFh) : RETURN ;return to Call subroutine ;in page 0 (000h-7FFh) 4.5 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 4-15. However, IRP is not used in the PIC16C71X devices. A simple program to clear RAM locations 20h-2Fh using indirect addressing is shown in Example 4-2. EXAMPLE 4-2: 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 FIGURE 4-15: DIRECT/INDIRECT ADDRESSING For register file map detail see Figure 4-4. Note 1: The RP1 and IRP bits are reserved, always maintain these bits clear. Data Memory Indirect Addressing Direct Addressing bank select location select RP1:RP0 6 0 from opcode IRP(1) 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 Not Used |
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