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M38254M6-064 Datasheet(PDF) 11 Page - Mitsubishi Electric Semiconductor |
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M38254M6-064 Datasheet(HTML) 11 Page - Mitsubishi Electric Semiconductor |
11 / 70 page SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER MITSUBISHI MICROCOMPUTERS 3825 Group 11 FUNCTIONAL DESCRIPTION CENTRAL PPROCESSING UNIT (CPU) The 3825 group uses the standard 740 family instruction set. Refer to the 740 Family Software Manual for details on the instruction set. Machine-resident 740 family instructions are as follows: The FST and SLW instructions cannot be used. The STP, WIT, MUL, and DIV instructions can be used. [CPU Mode Register (CPUM)] 003B16 The CPU mode register is allocated at address 003B16. The CPU mode register contains the stack page selection bit and the internal system clock selection bit. Fig. 8 Structure of CPU mode register Not available Processor mode bits b1 b0 0 0 : Single-chip mode 0 1 : 1 0 : 1 1 : Stack page selection bit 0 : 0 page 1 : 1 page Not used (returns “1” when read) (Do not write “0” to this bit) Port XC switch bit 0 : I/O port function (stop oscillating) 1 : XCIN–XCOUT oscillating function Main clock (XIN–XOUT) stop bit 0 : Oscillating 1 : Stopped Main clock division ratio selection bit 0 : f(XIN)/2 (high-speed mode) 1 : f(XIN)/8 (middle-speed mode) Internal system clock selection bit 0 : XIN–XOUT selected (middle-/high-speed mode) 1 : XCIN–XCOUT selected (low-speed mode) CPU mode register (CPUM (CM) : address 003B16) b7 b0 |
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