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M38065E9XXXFP Datasheet(PDF) 8 Page - Renesas Technology Corp |
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M38065E9XXXFP Datasheet(HTML) 8 Page - Renesas Technology Corp |
8 / 75 page 7 MITSUBISHI MICROCOMPUTERS 3807 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER FUNCTIONAL DESCRIPTION Central Processing Unit (CPU) The 3807 group uses the standard 740 family instruction set. Refer to the table of 740 family addressing modes and machine instruc- tions or the SERIES 740 <Software> User´s Manual for details on the instruction set. Machine-resident 740 family instructions are as follows: The FST and SLW instructions cannot be used. The MUL, DIV, WIT and STP instruction can be used. The central processing unit (CPU) has the six registers. CPU Mode Register The CPU mode register contains the stack page selection bit and processor mode bits. The CPU mode register is allocated at address 003B16. CPU mode register (CPUM : address 003B16) b7 b0 Stack page selection bit 0 : 0 page 1 : 1 page Main clock (XIN-XOUT) stop bit 0 : oscillating 1 : stopped Main clock division ratio selection bits b7 b6 0 0 : φ = f(XIN)/2 (high-speed mode) 0 1 : φ = f(XIN)/8 (middle-speed mode) 1 0 : φ = f(XCIN)/2 (low-speed mode) 1 1 : Not available Processor mode bits b1 b0 0 0 : Single-chip mode 0 1 : Memory expansion mode 1 0 : Microprocessor mode 1 1 : Not available Port XC switch bit 0 : I/O port function (stop oscillating) 1 : XCIN-XCOUT oscillating function XCOUT drivability selection bit 0 : Low drive 1 : High drive Fig. 5. Structure of CPU mode register |
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