HT49R50 datasheet(27/59 Pages) HOLTEK

27 / 59 page

HT49R50

October 22, 1999

N o r m a l O pe r a t i on M ode :

D u r i n g a R e se t P u l se :

CO M 0 , C O M 1 , CO M 2

VL C D

1/ 2 V LC D

VSS

VL C D

1/ 2 V LC D

VSS

Al l LC D dr i v er o ut put s

LC D s egm ent s o n C O M

0, 1, 2 s i des bei ng u nl i t

CO M 0

CO M 1

CO M 2

O n l y L C D s e gm ent s on

C O M 0 s i de bei ng l i t

O n l y L C D s e gm ent s on

C O M 1 s i de bei ng l i t

O n l y L C D s e gm ent s on

C O M 2 s i de b ei ng l i t

LC D s egm ent s on

C O M 0 , 1 s i des b ei ng l i t

C O M 0 ,2 s i d e s b e i n g l i t

LC D s egm ent s on

C O M 1 , 2 s i des b ei ng l i t

Ha l t M o d e :

C O M 0 ,1 ,2 s i d e s b e i n g l i t

LC D s egm ent s on

CO M 0 , C O M 1 , CO M 2

Al l LC D dr i v er o ut put s

VL C D

1/ 2 V LC D

VSS

VL C D

1/ 2 V LC D

VSS

VL C D

1/ 2 V LC D

VSS

VL C D

1/ 2 V LC D

VSS

VL C D

1/ 2 V LC D

VSS

VL C D

1/ 2 V LC D

VSS

VL C D

1/ 2 V LC D

VSS

VL C D

1/ 2 V LC D

VSS

VL C D

1/ 2 V LC D

VSS

VL C D

1/ 2 V LC D

VSS

VL C D

1/ 2 V LC D

VSS

VL C D

1/ 2 V LC D

VSS

V DD

1/ 2 V LC D

VSS

LCD driver output (1/3 duty, 1/2 bias, R/C type)

LCD driver output

The output number of the HT49R50 LCD driver

can be 33´2or33´3or32´4 by options (i.e., 1/2

duty or 1/3 duty or 1/4 duty). The bias type of

LCD driver can be "R" type or "C" type. If the "R"

bias type is selected, no external capacitor is re-

quired. If the "C" bias type is selected, a capacitor

mounted between C1 and C2 pins is needed. The

bias voltage of LCD driver can be 1/2 bias or 1/3

bias by options. If 1/2 bias is selected, a capacitor

mounted between V2 pin and ground is required.

If 1/3 bias is selected, two capacitors are needed

for V1 and V2 pins. Refer to application diagram.

Buzzer

HT49R50 provides a pair of buzzer output BZ

and BZ, which share pins with PA0 and PA1 re-

spectively, ad determined by options. Its output

frequency can be selected by options.

When the buzzer function is selected, setting

the PA.0 and PA.1 "0" simultaneously, will en-

ables the buzzer output and sets the PA.0 "1" to

disable the buzzer output.

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