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參數(shù)資料
| 型號： | EM78P870 |
| 廠商： | ELAN Microelctronics Corp . |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8 BIT MICROCONTROLLER |
| 中文描述： | 8位微控制器 |
| 文件頁數(shù)： | 27/48頁 |
| 文件大?。?/td> | 313K |
| 代理商： | EM78P870 |
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EM78P870
8-bit OTP Micro-controller
_________________________________________________________________________________________________________________________________________________________________
* This specification is subject to be changed without notice.
24
8/19/2004 (V1.5)
The controller can drive LCD directly. LCD block is made up of LCD driver, display RAM, segment output
pins, common output pins and LCD operating bias pins.
Duty, the number of segment , the number of common and frame frequency are determined by LCD mode
register RE PAGE0 Bit 0~ Bit 1.
When 8, 9 or 16 LCD commons are used, LCD operating bias pins VC1, VC2, VC4 and VC5 need to be
connected 0.1uF capacitors to the ground (VC3 is not necessary). When 24 LCD common is used, all LCD
operating bias pins VC1 ~ VC5 need to be connected 0.1uF capacitors to the ground.
LCD driver can be controlled as different driving ability (refer to IOC6 PAGE1 Option-B register).
The basic structure contains a timing control which uses the basic frequency 32.768kHz to generate the
proper timing for different duty and display access. RE PAGE1 register is a command register for LCD
driver and display. The LCD display (disable, enable, blanking) is controlled by RE PAGE0 Bit 2 ~ Bit 3
and the driving duty is decided by RE PAGE Bit 0 ~ Bit 2. LCD display data is stored in data RAM which
address and data access controlled by registers R9, RA PAGE1 and RB PAGE1.
User can regulate the contrast of LCD display by IOC5 PAGE1 (BIAS3..BIAS0). Up to 16 levels contrast is
convenient for better display. And the internal voltage follower can afford large driving source.
COM signal : The number of COM pins varies according to the duty cycle used, as following:
in 1/8 duty mode COM8 ~ COM15 must be open.
In 1/9 duty mode COM9~ COM15 must be open
in 1/16 duty mode COM0 ~ COM15 pins must be used.
in 1/24 duty mode COM0 ~ COM23 pins must be used.
duty
COM0 ~ COM7
COM8
COM9
..
1/8
o
x
x
..
1/9
o
o
x
..
1/16
o
o
o
..
1/24
o
o
o
..
x : open, o : select
SEG signal: The segment signal pins are connected to the corresponding display RAM. The high byte to the
low byte Bit 0 ~ Bit 7 are correlated to COM0 ~ COM23 respectively . When a bit of display RAM is 1, a
select signal is sent to the corresponding segment pin, and when the bit is 0 , a non-select signal is sent to
the corresponding segment pin.
Bit 4 (KEYSCAN) : Key scan function enable control bit
0/1
disable/enable
If you enable key scan function LCD waveform will has a small pulse within a period like Fig.12.
COM15 COM15 ~ COM23
x
x
o
o
x
x
x
o
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