EM65568 ELAN Microelectronics Corp, EM65568 Datasheet - Page 27

• Manufacturer Part Number: EM65568
• Description: 130 Com/ 128 Seg 4096 Color Stn Lcd Driver
• Manufacturer: ELAN Microelectronics Corp

from the display data latch circuit when the LP fails. When FLM signals being output in one frame cycle are at “H”, the values
in the display starting line register are preset in the line counter and the line counter counts up at the falling of LP signals. The
display line address counter is synchronized with each timing signal of the LCD system to operate and is independent of
address counters X and Y.
7.7 Display RAM access using Windows Function
The EM65568 has window area setting command for specified display RAM area access. For use window function, need to set
up two position’s X and Y address. Also need set up auto increment mode (AXI=”1”, AYI=”1”). Two position means window
start position and window end position. The window start position’s X and Y address set to normal X address(AX) and Y
address(AY) registers. The window end position’s X and Y address set to Window X End Address (EX) and Window Y Enc
Address (EY) register. In window function access, can use modify write access with set to AIM=”1”. In case of using window
function access, should be set following registers before access to RAM.
X Address, Y Address, Window X End Address, Window Y End Address
Moreover, should be keep following address condition.
7.8 Display RAM Data and LCD (only monochrome mode)
One bit of display RAM data corresponds to one dot of LCD. Normal display and reverse display by REV register are set up as
follows.
Normal display (REV=0): RAM data = “0” not lighted
Reverse display (REV=1): RAM data = “0” lighted
* This specification is subject to be changed without notice.
WIN = “1”, AXI=”1”, AYI=”1”
RAM data = “1” lighted
RAM data = “1” not lighted
Window end X address(EX) Window start X address (AX)
Window end Y address(EY) Window start X address (AY)
(X,Y) Start Address
Window access area
X direction
All display RAM area
130 COM/ 128 SEG 4096 Color STN LCD Driver
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(X,Y) End Address
2005/3/8 (V1.2)
EM65568