RAiO RA8806 - Display Future
RAiO RA8806 - Display Future
RAiO RA8806 - Display Future
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Version 1.3<br />
<strong>RA8806</strong><br />
Two Layers Character/Graphic LCD Controller<br />
6-3 <strong>Display</strong> Data RAM (DDRAM)<br />
The <strong>RA8806</strong> embedded two 9.6Kbyte <strong>Display</strong> Data RAMs – DDRAM1 and DDRAM2. It can use for two<br />
layers mono-display or one layer 4-gray-levels display. The maximum resolution of supporting LCD<br />
panel is 320Column x 240Row. There are two modes to write the DDRAM, text mode and graphics<br />
mode. It provides a flexible and easy way to make the display.<br />
6-3-1 <strong>Display</strong> Layer and <strong>Display</strong> Mode Selection<br />
There are 4 possible displays way at 2 Modes combination.<br />
1. Only show DDRAM1 or DDRAM2: One DDRAM data will show on the screen, and another one<br />
DDRAM can be standby or as a CGRAM to created special font or symbol by users. Please refer<br />
to Section 6-11 “User Defined Font” for detail description.<br />
2. Two Layer Mode: In this mode, the screen will show the combination data of DDRAM1 and<br />
DDRAM2. There are 4 types combination that set by REG[12H] Bit[3:2].<br />
DDRAM1 “OR” DDRAM2<br />
DDRAM1 “XOR” DDRAM2<br />
DDRAM1 “NOR” DDRAM2<br />
DDRAM1 “AND” DDRAM2<br />
For detail please refer to Section 6-10-1-5 “Two Layer <strong>Display</strong>”.<br />
3. 4-Gray-level Mode: In gray mode, each pixel consists with 2 continuous bits in both DDRAM.<br />
4. Extension Mode: Two extension modes is support, and both DDRAM1 and DDRAM2 data will<br />
show on the screen.<br />
Horizontal extension mode (Max. resolution is 640 x 240 pixels).<br />
Vertical extension mode (Max. resolution is 320 x 480 pixels).<br />
6-3-2 Access Memory Selection<br />
There are one 512Byte CGRAM and two 9.6KByte DDRAMs in <strong>RA8806</strong>. The 512Byte CGRAM is<br />
used to generate user-define font, and the two DDRAM are used to store the display data. One of<br />
both DDRAM can be also store special font or symbol, that when only one DDRAM is active on the<br />
screen. Which RAM is available for MPU access is depending on the REG[12h] Bit[1:0]. Please<br />
refer to Section 5-2 “Register Description”.<br />
Table 6-9<br />
Reg. Bit_Num Description Reference<br />
Bit [6:4]<br />
<strong>Display</strong> Layer and <strong>Display</strong> Mode Selection<br />
MAMR<br />
Bit [3:2]<br />
Two Layer Mode Selection<br />
MPU Read/Write Memory Selection<br />
REG[12h]<br />
Bit [1:0]<br />
<strong>RAiO</strong> TECHNOLOGY INC. 40/193 www.raio.com.tw
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