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RA8802

Character/Graphic LCD-Controller Specification

RAIO 

Version 1.1

RA8802/8820

Character/Graphic LCD Controller

LD5

SYS_FQ

LD4

LD3

SYS_LD

LD2

SYS_PLR

LD1

OPM1

LD0

OPM0

Alternative function pin LD5/SYS_FQ.

It’s connected to LCD driver IC D5, when 8-bit LCD driver IC is used.

I/O

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

I/O

It’s connected to LCD driver IC D4. When 8 bit LCD driver IC is used.

Alternative function pin LD3/SYS_LD.

This pin is connected to D3 pin of LCD driver IC.

I/O

SYS_LD is for LCD driver data bus selection. Non-Pull when 8-bit LCD

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.

I/O

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.

I/O 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.

I/O It’s connected to LCD driver IC D0.

OPM1 and OPM0 are used to choose the test model of RA8802/8820. Do

not Pull-Low for this pin.

4.3 Clock Interface

Pin Name I/O

XA

I

XB

O

LPF

I

RA

I

Description

Oscillator Input.

This is the input signal of internal oscillator. Normally it connects to a

32768Hz X’tal. The XA, XB and LPF are used for X’tal and internal PLL.

If in RC_OSC 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.

LPF (Low Pass Filter) Input.

This input is used for internal PLL circuit.

Connect Resistance.

RAiO TECHNOLOGY INC.

5/7

www.raio.com.tw

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