EM65568 ELAN Microelectronics Corp, EM65568 Datasheet - Page 25

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

7.5 Display Start Address Register
This register determines the Y-address of the display RAM corresponding to the display start line. The display RAM data that
addressed Display Start Address register output to common driver start line. The actual common start line of LCD panel
depend on Display Start Common register and SHIFT bit of Display Control register. The register are preset every timing of
FLM signal variation in the display line counter. The line counter counts up being synchronized with LP input and generates
line addresses which read out sequentially 384 bits data from display RAM to LCD drive circuit.
7.6 Addressing of Display RAM
The EM65568 has built-in bit mapped display RAM. The display RAM consists of 1536 bits (12 bits*128) in the X-direction
and 130 bits in the Y-direction. In the gradation display mode, the EM65568 provides segment driver output for 16-gradation
display using 4 bits. The three outputs of the segment driver can be used for one pixel of RGB. When connected to an STN
color LCD panel, the EM65568 can display 128*130 pixels with 4096 colors (16 gradation * 16 gradation * 16 gradation). The
address area in the X-direction depends on the access bus size. In the X-direction, X Address register use to access; and in the
Y-direction, Y Address register use to access. Do not specify any address outside the effective address area in each access mode
because it is not permitted.
In Gradation Display Mode (MON=”0” )
8-bits bus size access
* This specification is subject to be changed without notice.
ABS=0
Y-address
ABS=1
Y-address
81H 7bit 5bit
81H 4bit 8bit
0H 7bit 5bit
0H 4bit 8bit
0H 1H ----------------------------------------------------------------- FEH FFH
0H 1H ----------------------------------------------------------------- FEH FFH
X-address
X-address
130 COM/ 128 SEG 4096 Color STN LCD Driver
25
7bit 5bit
7bit 5bit
4bit 8bit
4bit 8bit
2005/3/8 (V1.2)
EM65568