HD6473887 Datasheet, PDF (380/523 Pages) Renesas Technology Corp – Hitachi Single-Chip Microcomputer

13.3.3 Luminance Adjustment Function (V₀ Pin)
Figure 13-13 shows a detailed block diagram of the LCD drive power supply unit.
The voltage output to the V₀ pin is either V_CC or the 5 V output from the step-up conversion power
supply circuit. When either of these voltages is used directly as the LCD drive power supply, the
V₀ and V₁ pins should be shorted. Also, connecting a variable resistance, R, between the V₀ and
V₁ pins makes it possible to adjust the voltage applied to the V₁ pin, and so to provide luminance
adjustment for the LCD panel.
VCC
Step-up constant- ^5V Power supply
V0
voltage power supply
selector
R
V1
V2
V3
Note: * Applied only to the
H8/3887 Series.
VSS
Figure 13-13 LCD Drive Power Supply Unit
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