HTG2190 datasheet(13/50 Pages) HOLTEK

13 / 50 page

HTG2190

Rev. 1.20

July 5, 2002

Address

Bit No.

Label

Description

COL0

2BH

0~4

P0~P4

Color0 palette

5~7

Unused bit read only

COL1

2CH

0~4

P0~P4

Color1 palette

5~7

Unused bit read only

COL2

2DH

0~4

P0~P4

Color2 palette

5~7

Unused bit read only

How to select the color:

Dn+1

Color 0

Color 1

Color 2

Color 3

Segment

¾Common

LCDC register

Bit No.

Label

Function

COL3

0~4

P0~P4

Color3 palette

Unused bit, read as

²0²

LCD

Controls the LCD output (0=disable, 1=enable) (Default=1)

7RC

LCD clock source select (Default=0)

1=32768Hz crystal

0=system clock (note*)

COL3 register

Note:

* When the mask option is selected to 32K x

¢tal disable, user should be set ²0² to COL3.7.

But the 32K x

¢tal can¢t be disabled in the HT-IDE2000 tools, so user should take care of this difference.

An example of an ECB driving waveform is shown below:

8 COM, 1/4 bias LCD clock source=16384Hz

C O M 0

V D D

3 / 4 V D D

2 / 4 V D D

1 / 4 V D D

G N D

V L C D

V D D

3 / 4 V D D

2 / 4 V D D

1 / 4 V D D

G N D

w '

1 / 4 V L C D

- 1 / 4 V L C D

- V L C D

6 4 H z

O N

O . .

S E G

C O M 0 - S E G

N o t e : W ' R e a l a c t i v e s e g m e n t s i g n a l w i d t h W ' =

( a d j u s t a b l e w i d t h b y R A M A d d r e s s

2 B H , 2 C H , 2 D H b i t 0 ~ b i t 4 )

W : M a x . a c t i v e s e g m e n t s i g n a l w i d t h

1 W

3 2

3 1 W

3 2

HTG2190 Datasheet(PDF) 13 Page - Holtek Semiconductor Inc

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