MSM9005 查看數據表（PDF） - Oki Electric Industry

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MSM9005

DOT MATRIX LCD CONTROLLER WITH 8-DOT COMMON DRIVER AND 65-DOT SEGMENT DRIVER

Oki Electric Industry 

¡ Semiconductor

FEDL9005-03

MSM9005-xx

FUNCTIONAL DESCRIPTION

General Description of Block Diagram

1. Address Pointer

An address pointer is a 5-bit counter which assigns the write destination or read destination

address of CGA RAM and AB RAM, and the write destination address of CHB RAM and ABB

RAM. The value of the address pointer can be set by the LPA command. The value of the

address pointer is automatically incremented by 1 after executing the AINC and CHB

commands, or after transferring input display data.

2. Character Generator Address RAM (CGA RAM)

The character generator address RAM stores 8-bit character codes of the character generator

ROM. A maximum of thirteen 8-bit character codes can be stored.

3. Arbitrator RAM (AB RAM)

The arbitrator RAM stores the lighting data of the arbitrator. Lighting data is stored in 5 dot

units, and a maximum of 65 dots of lighting data can be stored.

4. Character Blink RAM (CHB RAM)

The character blink RAM stores character blink data. A maximum of 13 characters of blink

data can be stored.

5. Arbitrator Blink RAM (ABB RAM)

The arbitrator blink RAM stores blink data of the arbitrator. Blink data is stored in 5 dot units,

and a maximum of 65 dots of blink data can be stored.

6. Character Generator ROM (CG ROM)

The character generator ROM generates character patterns with 5 ¥ 7 dots. This ROM can store

a maximum of 256 types of characters, numerics, and symbols.

When an 8-bit character code of CG ROM is written to CGA RAM, character patterns with

5 ¥ 7 dots corresponding to 8-bit character code are displayed at the LCD display position

corresponding to the CGA RAM address.

Relationship between display screen, LCD output and memory address

Arbitrator

Screen

Character

RAM Arbitrator

Address Character

map

C1

C2

C3

C4

C5

C6

C7

C8

S1 S5 S6 S10 S11 S15 S16 S20 S21 S25 S26 S30 S31 S35 S36 S40 S41 S45 S46 S50 S51 S55 S56 S60 S61 S65

10000b 10001b 10010b 10011b 10100b 10101b 10110b 10111b 11000b 11001b 11010b 11011b 11100b

00000b 00001b 00010b 00011b 00100b 00101b 00110b 00111b 01000b 01001b 01010b 01011b 01100b

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