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External Power Supply
• When external power supply is input directly to pins V1OUT through V5OUT
A power supply can be applied directly to V1OUT, V2OUT, V3OUT, V4OUT, and V5OUT
from an external source by clearing bits LPS0 and LPS1 to 0 in control register 2 (LR1) to halt
the power supply to the built-in bleeder resistance circuit. Apply a voltage not exceeding V
pins V1OUT through V5OUT.
• When an external power supply is input to pin V1OUT
V1 to V5 can be generated by inputting an external power supply to V1OUT, and using the
built-in bleeder resistances by setting the LPS1 bit to 1 in control register 2 (LR1). Apply a
voltage not exceeding V
In either case, inputting a voltage exceeding V
14.3.10 LCD Drive Power Supply Voltages
There are six LCD drive power supply voltage values⎯V1 to V5, and V
voltage, and V
the lowest. As shown in figure 14.11, the common waveforms are formed from a
SS
combination of V1, V2, V5, and V
combination of V1, V3, V4, and V
waveforms, but the intermediate voltages are different.
In figure 14.11, the waveforms of outputs SEG1 to SEG40 differ according to the display data. In
this example, LCD panel lines for which COM1 is connected are illuminated, and all other dots
are not illuminated.
to pin V1OUT.
CC
may adversely affect the reliability of the chip.
CC
, while the segment waveforms are formed from a
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. V1 and V
SS
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14. Dot Matrix LCD Controller (H8/3854 Group)
are shared by both common and segment
Rev.3.00 Jul. 19, 2007 page 397 of 532
. V1 is the highest
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REJ09B0397-0300
to
CC
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