ra8806 RAIO Technology Inc., ra8806 Datasheet - Page 40

• Manufacturer Part Number: ra8806
• Description: Two Layers Character/graphic Lcd Controller
• Manufacturer: RAIO Technology Inc.

Preliminary Version 1.2
RAiO
6-3
DDRAM1 “OR” DDRAM2
DDRAM1 “XOR” DDRAM2
DDRAM1 “NOR” DDRAM2
DDRAM1 “AND” DDRAM2
Horizontal extension mode (Max. resolution is 640 x 240 pixels).
Vertical extension mode (Max. resolution is 320 x 480 pixels).
TECHNOLOGY INC.
The RA8806 embedded two 9.6Kbyte Display Data RAMs – DDRAM1 and DDRAM2. It can use for two
layers mono-display or one layer 4-gray-levels display. The maximum resolution of supporting LCD
panel is 320Column x 240Row. There are two modes to write the DDRAM, text mode and graphics
mode. It provides a flexible and easy way to make the display.
6-3-1 Display Layer and Display Mode Selection
6-3-2 Access Memory Selection
Display Data RAM (DDRAM)
There are 4 possible displays way at 2 Modes combination.
1. Only show DDRAM1 or DDRAM2: One DDRAM data will show on the screen, and another one
2. Two Layer Mode: In this mode, the screen will show the combination data of DDRAM1 and
3. 4-Gray-level Mode: In gray mode, each pixel consists with 2 continuous bits in both
4. Extension Mode: Two extension modes is support, and both DDRAM1 and DDRAM2 data will
There are one 512Byte CGRAM and two 9.6KByte DDRAMs in RA8806. The 512Byte CGRAM is
used to generate user-define font, and the two DDRAM are used to store the display data. One of
both DDRAM can be also store special font or symbol, that when only one DDRAM is active on the
screen. Which RAM is available for MPU access is depending on the REG[12h] Bit[1:0]. Please
refer to Section 5-2 “Register Description”.
MAMR
DDRAM can be standby or as a CGRAM to created special font or symbol by users. Please refer
to Section 6-11 “User Defined Font” for detail description.
DDRAM2. There are 4 types combination that set by REG[12H] Bit[3:2].
For detail please refer to Section 6-10-1-5 “Two Layer Display”.
show on the screen.
Reg.
Bit_Num
Bit [6:4]
Bit [3:2]
Bit [1:0]
Display Layer and Display Mode Selection
MPU Read/Write Memory Selection
Two Layer Mode Selection
Table 6-9
40/184
Description
Two Layers Character/Graphic LCD Controller
Reference
REG[12h]
www.raio.com.tw
RA8806
DDRAM.