NJU6631ACH Просмотр технического описания (PDF) - Japan Radio Corporation

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NJU6631ACH

16-CHARACTER 1-LINE DOT MATRIX LCD CONTROLLER DRIVER

Japan Radio Corporation  

NJU6631A

(1-6) Character Generator RAM (CG RAM)

The character generator RAM (CG RAM) can store any kinds of character pattern in 5 x 7 dots written by

the user program to display user’s original character pattern. The CG RAM can store 4 kinds of character in 5

x 7 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 7 dots).

Character Code

(DD RAM Data)

76543210

←

→

Upper bit Lower bit

0000* * 00

0000* * 01

CG RAM Address

43210

←

→

Upper bit Lower bit

000

001

010

011

00100

101

110

111

000

001

010

011

01100

101

110

111

000

001

Character Pattern

(CG RAM Data)

43210

←

→

Upper bit Lower bit

11110

10001

10001

11110

1 0 1 0 0 Character Pattern

1 0 0 1 0 Example (1)

10001

0 0 0 0 0 ←Cursor Position

10001

01010

11111

00100

1 1 1 1 1 Character Pattern

0 0 1 0 0 Example (2)

00100

0 0 0 0 0 ←Cursor Position

* : Don’t Care

0000* * 11

11

100

101

110

111

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

2.CG RAM address 0, 1 and 2 designate 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 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 correspond to the CG RAM data bits 0 to 4 are 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 it is

addressed by character code bits 0 to 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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