Application Circuits

Host controller with an HT1647 display system

*Note: The connection of IRQ and RD pin can be selected depending on the mC.

It is recommended to select 1/5 bias to fit TN-type, STN-type LCDs and select 1/4 bias to fitm

ECB-type LCDs.

Adjust R (external pull high resistance) to fit user¢s time base clock.

HT1647

20

April 21, 2000

IR Q

DB 0 ~ DB 3

*

On- c h i p OS C

OSC I

OSC O

C l o ck Ou t

E x t e r n al C l o c k 1 ( 32k H z )

E x t e r n al C l o c k 2 ( 32k H z )

CS

RD

WR

m C

C r yst a l

3276 8H z

H T 1647

LC D P a ne l

BZ

BZ

C OM 0 ~ C OM 1 5

S E G 0 ~ S E G 6 3

Pi e z o

* 1 / 5 B i a s ( o r 1 / 4 B i as ) , 1 / 16 D u t y

R*

VR

*

VD D

VL C D