ra8803 RAIO Technology Inc., ra8803 Datasheet - Page 28

• Manufacturer Part Number: ra8803
• Description: Two Layers Character/graphic Lcd Controller Specification
• Manufacturer: RAIO Technology Inc.

Version 2.5
RAiO
6-2 Command / Decoder Registers
6-3 Display Data RAM (DDRAM)
6-4 Display Timing Generator(DTGC)
6-5 LCD Display
TECHNOLOGY INC.
This circuit store and implement the command from MPU Interface. The register WLCR, MISC, APSR
and ADSR are used for system setting. Registers WCCR, DWLR, CPXR and CPYR are used for cursor
feature. Registers AWRR, AWBR, AWLR and AWTR are used for setting the range of active window.
The RA8803 set up registers – DWRR, DWBR, DWLR and DWTR to support (0,0) ~ (320,240) pixel
LCD Panel. And RA8822 use these registers to support (0,0) ~ (240,160) pixel LCD Panel.
Registers INTR, INTX and INTY provide the interrupt related functions to reduce MPU’s loading. The
registers KSCR, KSDR and KSER are used for Key Scan features. The others hardware such as
ADC(controlled by Registers TPSR, TPXR, TPYR, TPZR) and DAC(controlled by Register LCCR) are
also controlled by these circuit and related registers.
The RA8803 embedded two 9.6Kbyte display RAM for two layers display. It supports the maximum
resolution of LCD panel is 320Column x 240Row. RA8822 embedded two 4.8Kbyte display RAM and
support 240Column x 160Row for maximum resolution. The RA8803/8822 support both text and
graphics mode. The user could switch both two modes at any time.
The main function of DTGC is to generate Frame (FRM), Latch Pulse (LP), YD and Data Bus signals for
external LCD driver IC. RA8803/8822 could both support 4-bit and 8-bit LCD driver interface. SYS_DW
is for LCD driver data bus selection. If SYS_DW pull high then 8-bit LCD driver is used. If pull low then
4-bit LCD driver is used.
RA8803 support many different resolution of LCD panel. The maximum resolution - 320x240 dots that
means 20x 15 full size Chinese character(RA8803/8822 define a Chinese character is 16x16 dots and
ASCII is 8x16). Due to the smaller display RAM size, the maximum resolution of RA8822 is 240x160
D7 D6 D5 D4 D3 D2 D1 D0
1 1
Display Data RAM
1 0 0 1 1
Figure 6-3: Display Data to LCD Map
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Two Layers Character/Graphical LCD Controller
0
1
2
Display On LCD
Segment
3
4
5
RA8803/8822
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