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參數資料
| 型號： | MC68HC708LN56 |
| 廠商： | Motorola, Inc. |
| 英文描述： | 8-Bit Microcontroller Units (MCU).(8位微控制器) |
| 中文描述： | 8位微控制器單元（MCU）。（8位微控制器） |
| 文件頁數： | 3/20頁 |
| 文件大小： | 103K |
| 代理商： | MC68HC708LN56 |
Application Note
The MC68HC708LN56 Microcontroller
AN1762
MOTOROLA
3
The MC68HC708LN56 Microcontroller
The MC68HC708LN56 MCU has an onboard LCD controller/driver
module which is capable of directly driving a dot matrix display with 32
backplanes and up to 40 frontplanes. Typically, this is a display
composed of four rows of eight characters or two rows of 16 characters.
All necessary voltage levels for the LCD waveforms are generated by an
onboard charge pump. Six voltage levels are produced for what is called
1/7 bias. The levels are adjustable and scale as a fraction of the top LCD
voltage, V
LL7
, as described later. Integrating the LCD controller/driver
with the microcontroller reduces system cost for the user.
The LCD waveforms have 1/32 duty, which means they are multiplexed
in 32 time intervals.
Figure 2
shows the waveforms for a backplane and a frontplane with
alternating ON and OFF data. The voltage across a pixel is the
difference of the backplane and frontplane waveform, shown as the
waveform BP0–FPX.
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