HD66730 Datasheet, PDF (125/131 Pages) Hitachi Semiconductor – Dot-Matrix Liquid Crystal Display Controller/Driver Supporting Japanese Kanji, Korean Font Display

HD66730/HD66731
10. Input/output current is excluded. When input is at an intermediate level with CMOS, the excessive
current flows through the input circuit to the power supply. To avoid this from happening, the input
level must be fixed high or low.
11. Applies only to external clock operation.
Th
Tl
Oscillator
OSC1
Open
OSC2
0.7 V_CC
0.5 V_CC
0.3 V_CC
t _rcp
t _fcp
Duty = ^Th × 100%
Th + Tl
12. Applies only to the internal oscillator operation using oscillation resistor R_f.
Recommended registor value
R_f
OSC1
OSC2
Rf: 150kΩ±2% (When V_CC = 3V to 4V)
Rf: 180kΩ±2% (When V_CC = 4V to 5V)
Since oscillation frequency varies depending on OSC1 and OSC2
terminal capacitance,wiring length to these pins should be minimized.
200
150
100
V_CC = 5V (typ.)
V_CC = 3V (typ.)
50
0
100 ¹⁵⁰ 200
300
400
500
600
700
800
R_f (kΩ)
124