CM2915

LCD Driver (19*4) with Key Scan (4*8)

* All specs and applications shown above subject to change without prior notice.

1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU ,

TAOYUAN, TAIWAN

Email: server@ceramate.com.tw

Tel:886-3-3214525

Http: www.ceramate.com.tw

Fax:886-3-3521052

Page 10 of 19

Rev 1.0 Aug.1, 2003

6

To set the custom codes ( A0 - - - A15 )

The algorithm rule of the custom codes ( A0 - - - A15 ) can be selected by mask option，and the user can

choose the CM2915-1 or CM2915-2。

A.

The CM2915-1 custom code

The value of ROM1 (8 bits) & ROM2 (8 bits) are both “ 00H “，and it is decided by one

mask layer 。The A0 - - A7 are set by logical OR between the switches (S0 - - S7) and

ROM1。The A8 - - A15 equal some bits be inverted of A0 - - A7，the inversion are decided by logical

OR between the switches (S8 - - S15) and ROM2。

For example :

CM2915-1

S8

S0

C1

AIN

1 : Switch close

S9

S1

C2

S10

S2

C3

S11

S3

C4

S12

S4

C5

S13

S5

C6

S14

S6

C7

S15

S7

C8

0 : Switch open

1N4148

200K

1N4148

200K

1N4148

200K

1N4148

200K

1N4148

200K

1N4148

200K

1N4148

200K

1N4148

200K

RLCD-4

S0 - - S7

S8 - - S15

External switch S0 - - - S15 :

→

0

1

0

1

0

1

0

0

1

1

0

0

0

1

0

0

ROM1

ROM2

On chip ROM1，ROM2 :

→

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

(S0 - - S7)

OR

ROM1

A0 - - A7 :

→

0

1

0

1

0

1

0

0

(S8 - - S15)

OR

ROM2

A8’ - - A15’ :

→

1

1

0

0

0

1

0

0

x

x

↓ ↓ ↓ x ↓ ↓

1 : non-inversion

A0

A1

-

-

-

A5

-

-

0 : inversion

-

-

A2B A3B A4B

-

A6B A7B

A8 - - A15 :

→

0

1

1

0

1

1

1

1

A0 - - A7

A8 - - A15

Custom codes A0 - - - A15 :

→

0

1

0

1

0

1

0

0

0

1

1

0

1

1

1

1