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M38K01MB-XXXHP Datasheet(PDF) 9 Page - Renesas Technology Corp |
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M38K01MB-XXXHP Datasheet(HTML) 9 Page - Renesas Technology Corp |
9 / 133 page 38K0 Group Rev.3.00 Oct 05, 2006 page 9 of 129 REJ03B0192-0300 [CPU Mode Register (CPUM)] 003B16 The CPU mode register contains the stack page selection bit and the internal system clock selection bit. The CPU mode register is allocated at address 003B16. Fig. 7 Structure of CPU mode register Processor mode bits b1 b0 0 0 : Single-chip mode 01 : 1 0 : Not available 11 : Stack page selection bit 0 : 0 page 1 : 1 page Not used (returns “1” when read) (Do not write “0” to this bit) Not used (returns “0” when read) (Do not write “1” to this bit) System clock selection bit 0 : Main clock (XIN) 1 : fSYN System clock division ratio selection bits b7 b6 00 : φ = f(system clock)/8 (8-divide mode) 01 : φ = f(system clock)/4 (4-divide mode) 10 : φ = f(system clock)/2 (2-divide mode) 11 : φ = f(system clock) (Through mode) CPU mode register (CPUM : address 003B16) b7 b0 1 0 |
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