ra8802 RAIO Technology Inc., ra8802 Datasheet - Page 8

• Manufacturer Part Number: ra8802
• Description: Character/graphic Lcd Controller
• Manufacturer: RAIO Technology Inc.

Version 1.3
RAiO
4.3 Clock Interface
TECHNOLOGY INC.
SYS_PLR
Pin name
SYS_DB
SYS_FQ
SYS_LD
SYS_MI
OPM1
OPM0
LD7
LD6
LD5
LD4
LD3
LD2
LD1
LD0
XA
XB
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
O
I
Alternative function pin LD7/SYS_MI.
It’s connected to LCD driver IC D7, when 8-bit LCD driver IC is used.
SYS_MI is for MCU type selection. It’s active on reset period. Non-Pull
when 6800 MCU is used. Pull low when 8080 MCU series are used.
Alternative function pin LD6/SYS_DB.
It’s connected to LCD driver IC D6, when 8-bit LCD driver IC is used.
SYS_DB is for MCU data bit selection. Non-Pull when 8-bit MCU is used.
Pull low when 4-bit MCU is used. The high nibble data bus DB[7..4]
Should tied to GND When 4-bit MCU is used.
Alternative function pin LD5/SYS_FQ.
It’s connected to LCD driver IC D5, when 8-bit LCD driver IC is used.
SYS_FQ is for RA8802/8820 clock source selection. Non-Pull will enable
internal PLL circuit and X’tal will be the clock source of RA8802/8820. Pull
low when RC oscillator is used and it will disable internal PLL.
LD4
Alternative function pin LD3/SYS_LD.
This pin is connected to D3 pin of LCD driver IC.
driver is used. Pull low when 4-bit LCD driver is used.
It’s connected to LCD driver IC D2.
SYS_PLR is polarity select. It’s connected to LCD driver IC D2.
SYS_PLR is for RS polarity selection.
When Non-Pull, then “RS” = 0 means Register Access Cycle, and “RS” = 1
means Data Access Cycle.
When Pull Low, then “RS” = 1 means Register Access Cycle, and “RS” = 0
means Data Access Cycle.
Alternative function pin LD1/OPM1.
It’s connected to LCD driver IC D1.
OPM1 and OPM0 are used to choose the test model of RA8802/8820. Do
not Pull-Low for this pin.
Alternative function pin LD0/OPM0.
It’s connected to LCD driver IC D0.
not Pull-Low for this pin.
Oscillator Input.
This is the input signal of internal oscillator. Normally it connects to a 32768Hz
X’tal.
mode, then XA, XB and LPF should be Floating.
Oscillator Output.
This is the output signal of internal oscillator. Normally it connects to a 32768Hz
X’tal.
It’s connected to LCD driver IC D4. When 8 bit LCD driver IC is used.
OPM1 and OPM0 are used to choose the test model of RA8802/8820.
SYS_LD is for LCD driver data bus selection. Non-Pull when 8-bit LCD
The XA, XB and LPF are used for X’tal and internal PLL. If in RC_OSC
8/8
Description
Character/Graphic LCD Controller
RA8802/8820
www.raio.com.tw
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