EM65570 ELAN Microelectronics Corp, EM65570 Datasheet - Page 28

• Manufacturer Part Number: EM65570
• Description: 68com / 98seg 65k Color Stn Lcd Driver
• Manufacturer: ELAN Microelectronics Corp

EM65570
68COM/ 98SEG 65K Color STN LCD Driver
22 x
7.6 Display RAM Access Using the Windows Function
7.7 Display RAM Data and LCD
RAM area. To use the window function, you need to set up the X & Y address
positions. In addition, you also need to enable the auto-increment mode (AXI=”1”,
AYI=”1”). These two positions represent the window start position and window end
position. Set the X address (AX) and Y address (AY) registers to specify the window
start position of X and Y respectively. Set the Window X End address (EX) and
Window Y End address (AY) to specify the window end positions of X and Y
respectively. When accessing the window function, you can set AIM to “1” to modify
write access. You should set the following registers before accessing RAM when you
use the window function.
WIN = “1”, AXI=”1”, AYI=”1”
„ Window end X address (EX)
„ Window end Y address (EY)
reverse display by the REV register are set up as follows:
„ Normal display (REV=0): RAM data = “0,” light OFF
„ Reverse display (REV=1): RAM data = “0,” light ON
The EM65570 has a window area setting command for accessing a specified display
X Address, Y Address, Window X End Address, Window Y End Address
Moreover, the following address condition must be met:
One bit of display RAM data corresponds to one dot of LCD. Normal display and
Figure 7-8 Window XY Address Location within RAM Display
X,Y Start Address
RAM data = “1,” light ON
RAM data = “1” light OFF
X Direction
X,Y End Address
Window start Y address (AY)
Window start X address (AX)
(This specification is subject to change without further notice)
Product Specification (V1.0) 09.05.2005
The Window
accessed area
The entire RAM
display area
(shaded + Window
accessed areas)