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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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7721 датащи(PDF) 39 Page - Renesas Technology Corp |
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7721 датащи(HTML) 39 Page - Renesas Technology Corp |
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39 / 577 page  7721 Group User’s Manual CENTRAL PROCESSING UNIT (CPU) 2–16 2.3.1 Banks The access space is divided in units of 64 Kbytes. This unit is called “bank.” The high-order 8 bits of address (24 bits) indicate a bank, which is specified by the program bank register (PG) or data bank register (DT). Each bank can be accessed efficiently by using an addressing mode that uses the data bank register (DT). If the program counter (PC) overflows at a bank boundary, the contents of the program bank register (PG) is incremented by 1. If a borrow occurs in the program counter (PC) as a result of subtraction, the contents of the program bank register (PG) is decremented by 1. Normally, accordingly, the user can program without concern for bank boundaries. SFR (Special Function Register) and internal RAM are assigned in bank 016. For details, refer to section “2.4 Memory assignment.” 2.3.2 Direct page A 256-byte space specified by the direct page register (DPR) is called “direct page.” A direct page is specified by setting the base address (the lowest address) of the area to be specified as a direct page into the direct page register (DPR). By using a direct page addressing mode, a direct page can be accessed with less instruction cycles than otherwise. Note: Refer also to section “2.1 Central processing unit.” 2.3 Access space |
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