HT46C64 datasheet(25/47 Pages) HOLTEK

25 / 47 page

HT46R64/HT46C64

Rev. 1.40

September 21, 2004

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

N o r m a l O p e r a t i o n M o d e

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

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

V L C D

1 / 2 V L C D

V S S

V L C D

1 / 2 V L C D

V S S

A l l L C D d r i v e r o u t p u t s

C O M 0

C O M 1

C O M 2 *

H A L T M o d e

V L C D

1 / 2 V L C D

V S S

V L C D

1 / 2 V L C D

V S S

V L C D

1 / 2 V L C D

V S S

V L C D

1 / 2 V L C D

V S S

V L C D

1 / 2 V L C D

V S S

V L C D

1 / 2 V L C D

V S S

V L C D

1 / 2 V L C D

V S S

V L C D

1 / 2 V L C D

V S S

V L C D

1 / 2 V L C D

V S S

V L C D

1 / 2 V L C D

V S S

V L C D

1 / 2 V L C D

V S S

V L C D

1 / 2 V L C D

V S S

V L C D

1 / 2 V L C D

V S S

N o t e : " * " O m i t t h e C O M 2 s i g n a l , i f t h e 1 / 2 d u t y L C D i s u s e d .

L C D s e g m e n t s O N

C O M 0 , 1 , 2 s i d e s a r e u n l i g h t e d

O n l y L C D s e g m e n t s O N

C O M 0 s i d e a r e l i g h t e d

O n l y L C D s e g m e n t s O N

C O M 1 s i d e a r e l i g h t e d

O n l y L C D s e g m e n t s O N

C O M 2 s i d e a r e l i g h t e d

L C D s e g m e n t s O N

C O M 0 , 1 s i d e s a r e l i g h t e d

L C D s e g m e n t s O N

C O M 0 , 2 s i d e s a r e l i g h t e d

L C D s e g m e n t s O N

C O M 1 , 2 s i d e s a r e l i g h t e d

L C D s e g m e n t s O N

C O M 0 , 1 , 2 s i d e s a r e l i g h t e d

A l l l c d d r i v e r o u t p u t s

LCD Driver Output (1/3 Duty, 1/2 Bias, R/C Type)

LCD Segments as Logical Output

The SEG0~SEG23 also can be optioned as logical out-

put, once an LCD segment is optioned as a logical out-

put, the content of bit0 of the related segment address in

LCD RAM will appear on the segment.

SEG0~SEG7 is together byte optioned as logical out-

put, SEG8~SEG15 are bit individually optioned as logi-

cal outputs.

LCD Type

R Type

C Type

LCD Bias

Type

1/2

bias

1/3

bias

1/2

bias

1/3 bias

VMAX

If VDD>VLCD, then

VMAX connect to VDD,

else VMAX connect to

VLCD

If VDD >

VLCD, then

VMAX connect to VDD,

else VMAX connect to

Low Voltage Reset/Detector Functions

There is a low voltage detector (LVD) and a low voltage

reset circuit (LVR) implemented in the microcontroller.

These two functions can be enabled/disabled by op-

tions. Once the LVD options is enabled, the user can

use the RTCC.3 to enable/disable (1/0) the LVD circuit

and read the LVD detector status (0/1) from RTCC.5;

otherwise, the LVD function is disabled.

The LVR has the same effect or function with the exter-

nal RES signal which performs chip reset. During HALT

state, LVR is disabled both LVR and LVD are disabled.

The microcontroller provides low voltage reset circuit in

order to monitor the supply voltage of the device. If the

supply voltage of the device is within the range

0.9V~VLVR, such as changing a battery, the LVR will au-

tomatically reset the device internally.

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