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3886 Datasheet(PDF) 38 Page - Renesas Technology Corp |
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3886 Datasheet(HTML) 38 Page - Renesas Technology Corp |
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38 / 380 page  1-13 3886 Group User’s Manual HARDWARE [CPU Mode Register (CPUM)] 003B16 The CPU mode register contains the stack page selection bit, the processor mode bits specifying the chip operation mode, etc. The CPU mode register is allocated at address 003B16. Fig. 9 Structure of CPU mode register FUNCTIONAL DESCRIPTION Processor mode bits b1 b0 0 0 : Single-chip mode 0 1 : Memory expansion mode (Note) 1 0 : Microprocessor mode (Note) 1 1 : Not available 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 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 Note: This mode is not available for M38869M8A/MCA/MFA and the flash memory version. 1 CPU mode register (CPUM : address 003B16) b7 b0 Stack page selection bit 0 : 0 page 1 : 1 page Fix this bit to “1”. |
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