NJU6635CH 데이터 시트보기 (PDF) - Japan Radio Corporation

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NJU6635CH

16-CHARACTER 2-LINE DOT MATRIX LCD CONTROLLER DRIVER

Japan Radio Corporation  

NJU6635

(1-6)Character Generator RAM

The character generator RAM (CG RAM) stores any kinds of character pattern in 5 x 8 dots written by

the user program to display user’s original character pattern. The CG RAM stores 4 kinds of character

in 5 x 8 dots mode.

To display user’s original character pattern stored in the CG RAM, the address data (00)H – (03)H

should be written to the DD RAM as shown in Table 2.

Table 3. shows the correspondence among the character pattern, CG RAM address and data.

Table 3. Correspondence of CG RAM address, DD RAM character code

and CG RAM character pattern (5 x 8 dots)

Character Code

(DD RAM Data)

CG RAM Address

Character

Pattern

(CG RAM Data)

76543210

←

→

Upper bit Lower bit

←

Upper bit

43 210

→

Lower bit

43210

←

→

Upper Lower

bit

bit

000

11110

001

10001

010

10001

Character

0000∗∗00

00 0 1 1

100

11110

10100

Pattern

Example (1)

101

10010

110

10001

111

0 0 0 0 0 ←Cursor Position

000

10001

001

01010

010

11111

Character

0000∗∗01

01 011

100

00100

11111

Pattern

Example (2)

101

110

00100

00100

111

0 0 0 0 0 ← Cursor Position

000

001

!

!

!

!

!

!

!

!

!

!

!

!

!

!

!

!

!

!

!

!

0000∗∗11

11

100

101

110

111

Notes: 1. Character code bits 0 and 1 correspond to the CG RAM address 3 and 4 ( 2bits : 4 patterns).

2. CG RAM address 0, 1 and 2 designate a character pattern line position.

The 8th line is the cursor position and the display is performed by logical OR with cursor.

Therefore, in case of the cursor display, the data of 8th line should be “0”.

If there is “1” in the 8th line, the bit “1” is always displayed on the cursor position regardless of

cursor existence.

3. Character pattern row position corresponding to the CG RAM data bits 0 to 4 are all shown above.

The bits 5 to 7 of the CG RAM do not exist.

4. CG RAM character patterns are selected when character code bits 4 to 7 are all “0” and addressed

by character code bits 0 and 1. Therefore the address (00)H, (04)H, (08)H and (0C)H, select the

same character pattern as shown In table 2 and Table 3.

5. ”1” for CG RAM data corresponds to display On and “0” to display Off.

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