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參數(shù)資料
| 型號(hào)： | HD66705U |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver(圖形LCD控制器/驅(qū)動(dòng)器) |
| 中文描述： | 低功耗點(diǎn)陣液晶顯示控制器/驅(qū)動(dòng)器（圖形液晶顯示控制器/驅(qū)動(dòng)器） |
| 文件頁(yè)數(shù)： | 46/81頁(yè) |
| 文件大?。?/td> | 426K |
| 代理商： | HD66705U |
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HD66705U
46
Oscillator Circuit
The
HD66705U
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 2-
lines are displayed with 1/18 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.
HD66705U
1) When an external clock is used
2) When an internal oscillator is used
HD66705U
Figure 28 Oscillator Circuit
Table 19
Oscillation Frequency and LCD Frame Frequency
Item
1-Line Display
NL = 0
2-Line Display
NL = 1
Multiplexing duty ratio
1/10
1/18
Oscillator resistance (R
f
)
CR oscillator frequency
V
CC
= 3V
620 k
300 k
45 kHz
95 kHz
Frame frequency
75 Hz
88 Hz
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相關(guān)代理商/技術(shù)參數(shù) |
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| HD66710 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:(Dot Matrix Liquid Crystal Display Controller/Driver) |
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| HD66710A00TF | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:(Dot Matrix Liquid Crystal Display Controller/Driver) |
| HD66712 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Dot-Matrix Liquid Crystal Display Controller/Driver |
| HD66712A00TA0 | 制造商:Renesas Electronics Corporation 功能描述: |
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