ra8803 RAIO Technology Inc., ra8803 Datasheet - Page 29

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

Version 2.5
RAiO
6-6 Font ROM and Font Size
6-7 System Clock
TECHNOLOGY INC.
dots -- 15x 10 Chinese character. For different resolution of panel, RA8803/8822 could change the
setting of some registers like DWRR, DWBR, DWLR and DWTR to modify display window size. And use
registers AWRR, AWBR, AWLR and AWTR to change the active window size.
For example, if use RA8803 to support 320x240 LCD panel, then the related register setting are as
following:
The active window range is less than display window. So user has to care the rule as following:
RA8803/8822 embedded 512KByte Font ROM, having the standard and special fonts(16x16) of BIG5,
GB, and ASCII(8x16) code. It can support the display 16x16 dot for full-size fonts consisting of Chinese,
8x16 dots for half-size fonts of alphanumeric characters and symbols in the same display.
Besides that, it also features with bigger Font size. Users can use Register FVHT to set the Font size to
16x32, 16x48, 16x64, 32x16, 32x32, 32x48, 32x64, 48x16, 48x32, 48x48, 48x64, 64x16, 64x32, 64x48
and 64x64 for maximum.
The RA8803/8822 also provide Font ROM readable feature. The MPU could read the bitmap of each
font from Font ROM for other application.
RA8802/8803 could depend on SYS_FQ Pull High or Low to decide the clock source. Pull Low is using
internal PLL and external 32KHz crystal, and Pull High is using external CLK input as clock source.
6-7-1 PLL/OSC Circuit
RA8803/8822 is built in PLL/OSC circuits. By using an external 32KHz crystal, internal PLL could
generate higher clock which system needs. When choosing a different resolution of panel, users
could set Register CKB1 and CKB0 for system clock selection to reduce the power consumption.
RA8803/8822-T: Built-in 13,094 standard Traditional Chinese character, 408 special character and
4 blocks ASCII character.
RA8803/8822-S: Built-in 7,602 standard Simple Chinese character, 408 special character and 4
blocks ASCII character.
1. DWRR≥ AWRR≥ CPXR≥ AWLR≥ DWLR
2. DWBR≥ AWBR≥ CPYR≥ AWTR≥ DWTR
DWRR = ( 320 / 8 ) - 1 = 39 = 27h
DWBR = 240 – 1 = 239 = EFh
DWLR = 0
DWTR = 0
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Two Layers Character/Graphical LCD Controller
RA8803/8822
www.raio.com.tw