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參數(shù)資料
| 型號(hào)： | MC68HC705L16 |
| 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(shù)： | 6/28頁 |
| 文件大小： | 139K |
| 代理商： | MC68HC705L16 |
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Application Note
AN1763
6
MOTOROLA
The total number of pins needed for static mode drive is equal to the
number of total segments in the display plus one. Unfortunately, as the
size of the LCD display increases, the number of required LCD driver
pins becomes very large.
As
Table 1
shows, for more than a few 8-segment characters, the
number of pins required becomes unreasonable. For small displays,
though, this type of LCD drive is commonly used since it produces
excellent contrast.
Multiplex Modes
To reduce the number of drivers required, the data for each frontplane
can be multiplexed to control multiple segments by using multiple
backplanes. This is done by multiplexing the driving voltages in time.
For instance:
If each frontplane controls two segments, two backplanes are
needed. This is called duplex mode.
Triplex mode is where each frontplane driver controls three
segments and three backplanes are needed.
Similarly, quadraplex mode has each frontplane driver controlling
four segments and has four backplane drivers.
Table 1. LCD Driver Pins Versus Multiplexing
Display Type
Total
Segments/ Pixels
Number of Driver Pins
Static
1/2 Duty
1/3 Duty
1/4 Duty
1/32 Duty
1 16-segment digit
16
17
10
9
8
N/A
4 7-segment digits
32
33
18
14
12
N/A
8 alphanumeric characters
120
121
62
43
34
36
32 5 x 8 pixel characters
1280
1281
642
430
324
72
General case
S
S +1
S/2 + 2
S/3 + 3
S/4 + 4
S/32 + 32
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| MC68HC705L5FUE | 功能描述:8位微控制器 -MCU 705L5-EPP-80QFP-6019 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
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