NJU6624AFG1 データシートの表示（PDF） - Japan Radio Corporation

部品番号

コンポーネント説明

メーカー

NJU6624AFG1

12-CHARACTER 1-LINE DOT MATRIX LCD CONTROLLER DRIVER with SMOOTH SCROLL FUNCTION

Japan Radio Corporation  

NJU6624A/B

gFUNCTIONAL DESCRIPTION

(1-1)Register

The NJU6624A/B incorporates two 8-bit registers, an Instruction Register(IR) and a Data Register(DR). The

Register (IR) stores instruction codes such as "Clear Display" and "Cursor Shift" or address data for Display Data

RAM(DD RAM), Character Generator RAM(CG RAM) and Icon Display RAM (MK RAM).

The Register(DR) is a temporary register, the data in the Register(DR) is written into the DD RAM, CG RAM or

MK RAM.

The data in the Register(DR) written by the MPU is transferred automatically to the DD RAM, CG RAM or MK

RAM by internal operation.

These two registers are selected by the selection signal RS as shown below.

(1-2)Address Counter (AC)

The address counter(AC) addresses the DD RAM, CG RAM or MK RAM.

When the address setting instruction is written into the Register(IR), the address information is transferred from

Register(IR) to the Counter(AC). The selection of either the DD RAM, CG RAM or MK RAM is also determined by

this instruction.

After writing (or reading) the display data to (or from) the DD RAM, CG RAM or MK RAM, the Counter(AC) incre-

ments (or decrements) automatically.

(1-3)Display Data RAM (DD RAM)

The display data RAM (DD RAM) consist of 14x 8 bits stores up to 14-character display data represented in 8-bit

code. (2 out of the 14characters are used for scroll RAM.)

The DD RAM address data set in the address counter(AC) is represented in Hexadecimal.

Higher

Lower

A C A C4 A C3 A C 2 A C 1 A C 0

(Example) DD RAM address " 08 "

0

1

0

0

0

HEX.

0

8

The relation between DD RAM address and display position on the LCD is shown below.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 -Display Position

00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D -DD RAM Address (Hex.)

| | Scroll RAM

When the display shift is performed,the DD RAM address changes as follows:

( Left Shift Display )

(00)<= 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 00

( Right Shift Display )

0D 00 01 02 03 04 05 06 07 08 09 0A 0B 0C =>(0E)

(1-4)Character Generator ROM (CG ROM)

The Character Generator ROM (CG ROM) generates 5 x 7 dots character pattern represented in 8-bit character

code.

The storage capacity is up to 224 kinds of 5 x 7 dots character pattern(available address is (20)H through (FF)H).

The correspondence between character code and standard character pattern of NJU6624A/B is shown in Table 2.

User-defined character patterns (Custom Font) are also available by mask option.

Share Link: