Chapter 4
Clock/ Mode/ Voltage Control
IV - 12 Clock Control
4.1.2 Change of the External Low-speed Oscillation Capability
The external low-speed oscillation starts with high-current driving capability at LSI power-on. After the oscilla-
tion stabilization, the LSI changes the oscillation to low-current driving capability for the low power consump-
tion.
If the current driving capability of oscillation is not enough, it can be changed by the rewriting enable register
(FBEWER: 0x03D80) and the clock mode control register (CLKMD: 0x03D8C).
To change the current driving capability, set the registers in operation with the internal low-speed oscillation.
Figure:4.1.2 Change of the External Low-speed Oscillation Capability
//Set the Rewriting Enable Register
FBEWER = 5A
//Set the Rewriting Enable Register
FBEWER = 00
//Set the Clock mode Control Register
CLKMD.bit6-4 = 010
SLOW mode
(SYSCLK = SRCCLK)
Changed the Current Driving Capability
of External Slow-speed Oscillation
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