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38K2 Datasheet, PDF (9/151 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER | |||
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38K2 Group
[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.
b7
01
Fig. 7 Structure of CPU mode register
b0
CPU mode register
(CPUM : address 003B16)
Processor mode bits
b1 b0
0 0 : Single-chip mode
0 1:
1 0 : Not available
1 1:
Stack page selection bit
0 : 0 page
1 : 1 page
Not used (returns â1â when read)
(Do not write â0â to this bit)
Not used (returns â0â when read)
(Do not write â1â to this bit)
System clock selection bit
0 : Main clock (XIN)
1 : fSYN
System clock division ratio selection bits
b7 b6
0 0 : Ï = f(system clock)/8 (8-divide mode)
0 1 : Ï = f(system clock)/4 (4-divide mode)
1 0 : Ï = f(system clock)/2 (2-divide mode)
1 1 : Ï = f(system clock) (Through mode)
Rev.3.00 Oct 15, 2006 page 9 of 147
REJ03B0193-0300
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