hd66731a01tb0l Renesas Electronics Corporation., hd66731a01tb0l Datasheet - Page 109

• Manufacturer Part Number: hd66731a01tb0l
• Description: Dot-matrix Liquid Crystal Display Controller/driver Supporting Japanese Kanji, Korean Font Display - Hitachi Semiconductor
• Manufacturer: Renesas Electronics Corporation.

HD66730/HD66731
Oscillator
Figure 41 shows the optimal value of the oscillation frequency or the external clock frequency depends on
the duty drive ratio setting (DT1/0), number of display lines (NL1/0), and the number of display characters
(NC1/0) in the HD66730/1. The oscillation frequency or the external clock frequency must be adjusted
according to the frame frequency of the liquid crystal drive.
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Note: The oscillator frequency can be adjusted by an oscillator resistor (Rf). Refer to Electrical
1) When an external clock is used
Characteristics for the relationship between the oscillator resistor (Rf) and the oscillator
frequency. If Rf is increased or power supply voltage is decreased, the oscillator frequency
decreases.
Clock
OSC1
HD66730
HD66731
Figure 41 Oscillator Connections
Rf
2) When an internal oscillator is used
OSC1
OSC2
HD66730
HD66731