S1C63666 TECHNICAL MANUAL
EPSON
29
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Power Control)
4.2.4 Programming notes
(1) When setting the low-speed operation voltage regulator to the halver mode, make sure that the
supply voltage is 2.4 V or higher using the SVD circuit before writing "1" to VDC2. Furthermore,
switch the CPU clock to OSC1.
(2) When setting the LCD system voltage circuit to the halver mode, make sure that the supply voltage is
2.4 V or higher using the SVD circuit before writing "1" to VDC3. Furthermore, set the V
C1
voltage
(contrast) to 1.13 V or lower (LC register = 6 or less).
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