NJU6635 New Japan Radio Co.,Ltd, NJU6635 Datasheet - Page 9

• Manufacturer Part Number: NJU6635
• Description: 16-character 2-line Dot Matrix Lcd Controller Driver
• Manufacturer: New Japan Radio Co.,Ltd

Table 3. Correspondence of CG RAM address, DD RAM character code
Notes: 1. Character code bits 0 and 1 correspond to the CG RAM address 3 and 4 ( 2bits : 4 patterns).
(1-6)Character Generator RAM
the user program to display user’s original character pattern. The CG RAM stores 4 kinds of character
in 5 x 8 dots mode.
should be written to the DD RAM as shown in Table 2.
The character generator RAM (CG RAM) stores any kinds of character pattern in 5 x 8 dots written by
To display user’s original character pattern stored in the CG RAM, the address data (00)
Table 3. shows the correspondence among the character pattern, CG RAM address and data.
2. CG RAM address 0, 1 and 2 designate a character pattern line position.
3. Character pattern row position corresponding to the CG RAM data bits 0 to 4 are all shown above.
4. CG RAM character patterns are selected when character code bits 4 to 7 are all “0” and addressed
5. ”1” for CG RAM data corresponds to display On and “0” to display Off.
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.
The bits 5 to 7 of the CG RAM do not exist.
by character code bits 0 and 1. Therefore the address (00)
same character pattern as shown In table 2 and Table 3.
Upper bit
7 6 5 4 3 2 1 0
0 0 0 0
0 0 0 0
0 0 0 0
Character Code
(DD RAM Data)





Lower bit
0 0
0 1
1 1
Upper bit
CG RAM Address





0 1
1 1
4 3
00
Lower bit
2 1 0
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
0 0 0
0 0 1
1 0 0
1 0 1
1 1 0
1 1 1





and CG RAM character pattern (5 x 8 dots)
Upper
(CG RAM Data)
H
, (04)
bit
Character
4 3 2 1 0
1 1 1 1
1
1
1 1 1 1
1
1
1
0 0 0 0 0
1
0
1 1 1 1 1
0 0
1 1 1 1 1
0 0
0 0
0 0 0 0 0
Pattern
0 0 0
0 0 0
0
0 0
0 0 0
0 0 0
1
1
0
1
1
1





H
0 0
1
1
0 0
0 0
0 0
, (08)
Lower
0
1
1
0
0
1
1
0
bit
H
and (0C)
NJU6635
Cursor Position
Character
Pattern
Example (1)
Character
Pattern
Example (2)
Cursor Position
H
, select the
H
– (03)
H