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參數(shù)資料
| 型號： | HCD66717A03BP |
| 廠商： | Hitachi,Ltd. |
| 元件分類： | 晶體 |
| 英文描述： | (Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver) |
| 中文描述： | （低功耗點陣液晶顯示控制器/驅(qū)動器） |
| 文件頁數(shù)： | 49/90頁 |
| 文件大?。?/td> | 716K |
| 代理商： | HCD66717A03BP |
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HD66717
501
Oscillator Circuit
The HD66717 can either be supplied with operating clock pulses externally (external clock mode) or
oscillate using an internal R-C oscillator and an external oscillator-resistor (internal oscillation mode), as
shown in Figure 28. An appropriate oscillator-resistor must be used to obtain the optimum clock
frequency according to the number of display lines (Table 18). Instruction execution times change in
proportion to the operating clock frequency or R-C oscillation frequency; MPU data transfer rate must be
appropriately adjusted (see Table 17, Instruction List). Figure 29 shows a sample LCD drive output
waveform, where 4-lines are displayed with 1/34 multiplexing duty ratio.
OSC1
OSC1
OSC2
Clock
Rf
The oscillator frequency can be
adjusted by oscillator resistance
(Rf). If Rf is increased or power
supply voltage is decreased, the
oscillator frequency decreases.
HD66717
1) When an external clock is used
2) When an internal oscillator is used
HD66717
Figure 28 Oscillator Circuit
Table 19
Oscillation Frequency and LCD Frame Frequency
Item
1-Line Display
NL1, NL0 = 00
2-Line Display
NL1, NL0 = 01
3-Line Display
NL1, NL0 = 10
4-Line Display
NL1, NL0 = 11
Multiplexing duty ratio
1/10
1/18
1/26
1/34
Oscillator resistance (R
f
)
CR oscillator frequency
V
CC
= 3V
620 k
40 kHz
300 k
85 kHz
200 k
120 kHz
150 k
160 kHz
Frame frequency
67 Hz
79 Hz
77 Hz
78Hz
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