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參數(shù)資料
| 型號： | M38207E8GP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PQFP80 |
| 封裝： | 0.65 MM PITCH, PLASTIC, QFP-80 |
| 文件頁數(shù)： | 26/67頁 |
| 文件大?。?/td> | 1099K |
| 代理商： | M38207E8GP |
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31
MITSUBISHI MICROCOMPUTERS
3820 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
LCD DRIVE CONTROL CIRCUIT
The 3820 group has the built-in Liquid Crystal Display (LCD) drive
control circuit consisting of the following.
LCD display RAM
Segment output enable register
LCD mode register
Selector
Timing controller
Common driver
Segment driver
Bias control circuit
A maximum of 40 segment output pins and 4 common output pins
can be used.
Up to 160 pixels can be controlled for LCD display. When the LCD
enable bit is set to “1” after data is set in the LCD mode register,
Fig. 23 Structure of segment output enable register and LCD mode register
7
Segment output enable register
(SEG : address 003816)
7
LCD mode register
(LM : address 003916)
Duty ratio selection bits
0 0 : Not available
0 1 : 2 (use COM0,COM1)
1 0 : 3 (use COM0–COM2)
1 1 : 4 (use COM0–COM3)
Bias control bit
0 : 1/3 bias
1 : 1/2 bias
LCD enable bit
0 : LCD OFF
1 : LCD ON
Not used (returns "0" when read)
(Do not write "1" to this bit)
LCD circuit divider division ratio selection bits
0 0 : LCDCK count source
0 1 : 2 division of LCDCK count source
1 0 : 4 division of LCDCK count source
1 1 : 8 division of LCDCK count source
LCDCK count source selection bit (Note)
0 : f(XCIN)/32
1 : f(XIN)/8192
Segment output enable bit 0
0 : Input ports P30–P37
1 : Segment output SEG16–SEG23
Segment output enable bit 1
0 : I/O ports P00, P01
1 : Segment output SEG24,SEG25
Segment output enable bit 2
0 : I/O ports P02–P07
1 : Segment output SEG26–SEG31
Segment output enable bit 3
0 : I/O ports P10,P11
1 : Segment output SEG32,SEG33
Segment output enable bit 4
0 : I/O port P12
1 : Segment output SEG34
Segment output enable bit 5
0 : I/O ports P13–P17
1 : Segment output SEG35–SEG39
Not used (return "0" when read)
(Do not write "1" to this bit)
Note : LCDCK is a clock for a LCD timing controller.
the segment output enable register and the LCD display RAM, the
LCD drive control circuit starts reading the display data automati-
cally, performs the bias control and the duty ratio control, and dis-
plays the data on the LCD panel.
Table 2. Maximum number of display pixels at each
duty ratio
Duty ratio
Maximum number of display pixel
80 dots
or 8 segment LCD 10 digits
120 dots
or 8 segment LCD 15 digits
160 dots
or 8 segment LCD 20 digits
2
3
4
0
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