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FM8PE53B Datasheet(PDF) 6 Page - Feeling Technology Corp. |
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FM8PE53B Datasheet(HTML) 6 Page - Feeling Technology Corp. |
6 / 53 page ![]() FM8PE53B Web site: http://www.feeling-tech.com.tw Rev1.02.011 Aug 21, 2014 P.6/FM8PE53B FEELING TECHNOLOGY 2.0 FUNCTIONAL DESCRIPTIONS 2.1 Operational Registers 2.1.1 INDF (Indirect Addressing Register) Address Name B7 B6 B5 B4 B3 B2 B1 B0 00h (r/w) INDF Uses contents of FSR to address data memory (not a physical register) The INDF Register is not a physical register. Any instruction accessing the INDF register can actually access the register pointed by FSR Register. 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). The bits 5-0 of FSR register are used to select up to 64 registers (address: 00h ~ 3Fh). Example 2.1: INDIRECT ADDRESSING Register file 38 contains the value 10h Register file 39 contains the value 0Ah Load the value 38 into the FSR Register A read of the INDF Register will return the value of 10h Increment the value of the FSR Register by one (@FSR=39h) A read of the INDF register now will return the value of 0Ah. Figure 2.1: Direct/Indirect Addressing location select addressing INDF register location select 3Fh 00h Indirect Addressing From FSR register 5 0 Direct Addressing From opcode 5 0 |
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