參數(shù)資料
型號： HD66727A03TA0L
廠商： Hitachi,Ltd.
英文描述： Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function
中文描述： 低功耗點陣液晶顯示控制器/鍵掃描功能驅(qū)動程序
文件頁數(shù)： 57/97頁
文件大?。?/td> 513K
代理商： HD66727A03TA0L
HD66727
57
Oscillator Circuit
The HD66727 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 31. An appropriate oscillator-resistor must be used to obtain the optimum clock frequency
according to the number of display lines (Table 29). 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 23, Instruction List). Figure 32 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.
HD66727
1) When an external clock is used
2) When an internal oscillator is used
HD66727
Figure 31 Oscillator Circuit
Table 29
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
R-C oscillation
frequency
(recommended value)
40 kHz
80 kHz
120 kHz
160 kHz
1-line drive frequency
0.66 kHz
1.3 kHz
2.0 kHz
2.7 kHz
Frame frequency
67 Hz
74 Hz
77 Hz
78 Hz
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