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參數(shù)資料
| 型號： | MSM6794 |
| 廠商： | OKI SEMICONDUCTOR CO., LTD. |
| 英文描述： | LCD Driver(LCD驅(qū)動器) |
| 中文描述： | LCD驅(qū)動器（液晶驅(qū)動器） |
| 文件頁數(shù)： | 26/34頁 |
| 文件大?。?/td> | 195K |
| 代理商： | MSM6794 |
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Semiconductor
26/34
MSM6794
Original Oscillation Frequency and Frame Frequency
Frame frequency calculation
For 1/33, 1/44, 1/48 DUTY:
(Original oscillation clock cycle)
￥
(1/frequency dividing ratio)
￥
4224 = frame cycle
................Formula 1
For 1/41 DUTY:
(Original oscillation clock cycle)
￥
(1/frequency dividing ratio)
￥
4264 = frame cycle
................Formula 2
Frame frequency can be calculated by the above formulas.
Example 1) For original oscillation 350 [kHz], frequency dividing ratio 1/1, and 1/33 duty
specification:
By formula 1, frame cycle Tf = 1 /(350
￥
10
3
)
￥
1
￥
4224 = 12.1 [ms]
Therefore, frame frequency = 82.9 [Hz]
Example 2) For original oscillation 1 [MHz], frequency dividing ratio 1/3, 1/41 duty specification:
By formula 2, frame cycle Tf = 1 /(1
￥
10
6
)
￥
3
￥
4264 = 12.8 [ms]
Therefore, frame frequency = 78.2 [Hz]
Original oscillation frequency and BUSY time
When RAM data is written or read, data processing time (BUSY time) occurs. BUSY time is a
maximum of [(original oscillation clock cycle)
￥
8]. As the original oscillation frequency
increases, BUSY time becomes shorter (not influenced by the frequency dividing ratio).
By increasing the original oscillation frequency, BUSY time can be made shorter in proportion.
In this case frame frequency also increases. So, set the frequency dividing ratio so that frame
frequency reaches a frequency close to the frame frequency to be used.
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