EM78R911 Ver la hoja de datos (PDF) - ELAN Microelectronics
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EM78R911 Datasheet PDF : 37 Pages
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EM78911
8-bit micro-controller
VII.11.1 LCD Driver Control
RE(LCD Driver Control)(initial state "00000000")
7
6
5
4
3
2
1
0
-
-
-
-
-
LCD_C2 LCD_C1 LCD_M
*Bit0 (LCD_M):LCD_M decides the methods, including duty, bias, and frame frequency.
*Bit1~Bit2 (LCD_C#):LCD_C# decides the LCD display enable or blanking. change the display duty must set
the LCD_C to "00".
LCD_C2,LCD_C1 LCD Display Control
LCD_M duty bias
00
change duty
0
1/16 1/4
Disable(turn off LCD)
1
1/8 1/4
01
Blanking
:
:
11
LCD display enable
:
:
VII.11.2 LCD display area
The LCD display data is stored in the data RAM . The relation of data area and COM/SEG pin is as below:
COM15 ~ COM8
40H (Bit15 ~ Bit8)
41H
:
:
7BH
7CH
7DH
7EH
7FH
COM7 ~ COM0
00H (Bit7 ~ Bit0)
01H
:
:
3BH
3CH
3DH
3EH
3FH
SEG0
SEG1
:
:
SEG59
empty
empty
empty
empty
*IOCB(LCD Display RAM address)
7
6
5
4
3
2
1
0
- LCDA6 LCDA5 LCDA4 LCDA3 LCDA2 LCDA1 LCDA0
Bit 0 ~ Bit 6 select LCD Display RAM address up to 120.
LCD RAM can be write whether in enable or disable mode and read only in disable mode.
*IOCC(LCD Display data) : Bit 0 ~ Bit 8 are LCD data.
VII.11.3 LCD COM and SEG signal
* 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 1/16 duty mode COM0 ~ COM15 pins must be used.
COM0 COM1 COM2 COM3 COM4 COM5 COM6 COM7 COM8 .. COM15
1/8
o
o
o
o
o
o
o
o
x ..
x
1/16 o
o
o
o
o
o
o
o
o ..
o
x:open,o:select
25
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