Chapter 4
Clock/ Mode/ Voltage Control
IV - 6 Clock Control
System Clock Control Register (CKCTR: 0x03F04)
..
Set the PSW.MIE to "0" before changing the data of CPU or CKCTR.
Insert 3 NOP instructions right after the instruction for changing CPUM or CKCTR.
..
..
The instruction for changing the data of CPUM or CKCTR must not be executed in the inter-
nal RAM.
..
bp 76543210
Bit name----- OSCSEL2-0
Initial value00000000
AccessRRRRRR/WR/WR/W
bp Bit name Description
7-3 - Always read as "00000"
2-0 OSCSEL2-0
The frequency of SYSCLK
000: f
HSCLK
001: f
HSCLK
/2
010: f
HSCLK
/4
011: f
HSCLK
/8
100: f
HSCLK
/16
101: f
HSCLK
/32
110: Setting is prohibited.
111: Setting is prohibited.
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