M38C31M7AXXXFS datasheet(48/224 Pages) RENESAS

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38C3 Group User’s Manual

HARDWARE

1-33

Duty

ratio

Voltage value

VL3=VLCD

VL2=2/3 VLCD

VL1=1/3 VLCD

VL3=VLCD

VL2=VL1=1/2 VLCD

VL3=VLCD

VL2=VL1=VSS

Bias Control and Applied Voltage to LCD Power

Input Pins

To the LCD power input pins (VL1–VL3), apply the voltage value shown

in Table 11 according to the bias value.

Select a bias value by the bias control bit (bit 2 of the LCD mode

Common Pin and Duty Ratio Control

The common pins (COM0–COM3) to be used are determined by duty

ratio.

Select duty ratio by the duty ratio selection bits (bits 0 and 1 of the

LCD mode register).

When selecting 1-duty ratio, 1/1 bias can be used.

Fig. 31 Example of circuit at each bias

Table 11 Bias control and applied voltage to VL1–VL3

Bias value

1/3 bias

1/2 bias

1/1 bias

(1-duty ratio)

Note 1: VLCD is the maximum value of supplied voltage for the LCD panel.

Table 12 Duty ratio control and common pins used

Notes 1: COM1, COM2, and COM3 are open.

2: COM2 and COM3 are open.

3: COM3 is open.

Common pins used

COM0 (Note 1)

COM0, COM1 (Note 2)

COM0–COM2 (Note 3)

COM0–COM3

Bit 1

Bit 0

Duty ratio selection bit

FUNCTIONAL DESCRIPTION

R4 = R5

Contrast control

1/2 bias

VL3

Contrast control

R1 = R2 = R3

1/3 bias

Contrast control

1/1 bias

VL1

VL2

VL3

VL1

VL2

VL3

VL1

VL2

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