Preliminary Version 1.0

144x65 Character/Graphic LCD Driver

RA8816N

3. Block Diagram

RA8816N

MPU

LCD Panel

4 x 5

Key Scan

GPIO

Figure 3-1 : System Block

The RA8816N is consisted of Display RAM, 256KB Font ROM, Command Registers, LCD Controller,

LCD Driver, Voltage Booster, Voltage Regulator, MPU Interface and Key-Scan circuit.

1170+450bytes

Display RAM + Buffer

MPU

I/F

Block

Register

Block

256Kx8 Font ROM

RC

Oscillator

256bytes

CGRAM

Key Scan

Control

Block

& INT

GPIO

Cursor

Control

144

Segment

Drivers

65

Common

Drivers

Voltage

Booster

Voltage

Regulator

Voltage

Follower

C[3:1]P C[2:1]M V0~V4 VOUT

SEG0~SEG143 COM0~COM63

COMS_A

COMS_B

DB[7:0]

RD(EN)

WR(R/W)

CS

D/C(RS)

C86

BIT4

P/S

KST[3:0]

KIN[4:0]

INT

IO[7:0]

CLK_SEL

EXT_CLK

RST

TEST[2:0]

TP[6:0]

Driver I/F

Scroll

Control

Scan

Control

LCDC Control Block

Test &

Power

Circuit

VR

VREF

Figure 3-2 : Internal Block

3/8

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