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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PIC16C71 датащи(PDF) 49 Page - Microchip Technology |
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PIC16C71 датащи(HTML) 49 Page - Microchip Technology |
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49 / 337 page  © 1997 Microchip Technology Inc. DS30234D-page 49 PIC16C6X Example 4-1 shows the calling of a subroutine in page 1 of the program memory. This example assumes that the PCLATH is saved and restored by the interrupt service 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. Address- ing 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 produce 00h. Writing to the INDF regis- ter 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 4-25. A simple program to clear RAM location 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 Applicable Devices 61 62 62A R62 63 R63 64 64A R64 65 65A R65 66 67 FIGURE 4-25: DIRECT/INDIRECT ADDRESSING For memory map detail see Figure 4-5, Figure 4-6, Figure 4-7, and Figure 4-8. bank select bank select location select location select Direct Addressing Indirect Addressing RP1: RP0 6 0 from opcode IRP 7 FSR 0 00 01 10 11 Bank 0 Bank 1 Bank 2 Bank 3 FFh 80h Data Memory 7Fh 00h 17Fh 100h 1FFh 180h |
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