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參數(shù)資料
| 型號(hào)： | MC68HC705L16 |
| 廠(chǎng)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(yè)數(shù)： | 12/28頁(yè) |
| 文件大小： | 139K |
| 代理商： | MC68HC705L16 |
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Application Note
AN1763
12
MOTOROLA
Sample Application
To demonstrate how simple it is to use the MC68HC705L16 to drive an
LCD panel directly, a simple application is described in which a text
message is displayed on an 8-digit, 15-segment display (Planar-
Standish Model 4228). The display will be driven by 1/4 duty and 1/3
bias.
Figure 11
shows a schematic diagram of the circuit with all connections
labelled. A resistor divider from V
DD
is used to generate the three
voltage levels, V
LCD1
, V
LCD2
, and V
LCD3
, for the waveforms. A variable
resistor at the bottom of the divider allows manual contrast adjustment.
The four backplane pins from the MCU are connected to the four
common pins on the LCD panel. Since the 1/4 duty is being used, four
segments can be driven by each frontplane driver and, therefore, 32
frontplanes drivers are needed. The first 32 frontplane pins from the
MCU are connected to the LCD panel, while the remaining seven are not
used.
These connections from the MCU to the LCD panel determine the
mapping of the LCD data registers to the segments of the LCD panel.
Each digit on the panel is composed of 16 segments, controlled by two
consecutive 8-bit LCD data registers. Each LCD data register controls
two frontplanes. Therefore, four frontplanes are required to drive each
digit of the display.
Figure 12
shows the mapping of the register bits to
the segments in one of the characters on the display.
For example, the letter G would be represented by the two bytes: $05E4.
The first byte in register LCDR1 would be 00000101. The second byte in
register LCDR2 would be 11100100. Together, the lit segments would
create the letter G. See
Figure 13
.
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