HT95C20P datasheet(31/51 Pages) HOLTEK

31 / 51 page

Bit No.

Label

R/W

Function

FRAME

LCD frame selection

0: LCD frame is 64Hz

1: LCD frame is 128Hz

VBIAS

LCD BIAS selection

0: select 1/16 duty and 1/5 bias, COM15~COM0 are available

1: select 1/8 duty and 1/4 bias, only COM15~COM8 are available

When the 8 COM is selected

HT95C400/40P: COM7~COM0 will be optioned to unused pins

HT95C300/30P: COM7~COM0 will be optioned to unused pins

HT95C200/20P: COM7~COM0 are disabled, PD7~PD0 are available

LBEN

Low battery detection switch

0: disable the low battery detection

1: enable the low battery detection

Unused bit, read as

²0²

LBFG

Low battery detection flag

1: LBIN pin voltage is less than 1.15V

0: LBIN pin voltage is not less than 1.15V

VCON0

VCON1

LCD contrast adjusting

Bit6,5=00: LCD voltage supply is 0.66

´VLCD

Bit6,5=10: LCD voltage supply is 0.82

´VLCD

Bit6,5=01: LCD voltage supply is 0.93

´VLCD

Bit6,5=11: LCD voltage supply is 1.00

´VLCD

LCDON

1: Turn on the LCD display

0: Turn off the LCD display

LCDC (2DH) Register

Bit No.

Label

R/W

Function

0~4

Unused bit, read as

²0²

SPE0

Supported for HT95C400/40P, HT95C300/30P

Bit value is 0:

HT95C400/40P: SEG47~SEG44 output are available

HT95C300/30P: SEG47~SEG44 output are available

Bit value is 1:

HT95C400/40P: PE3~PE0 output are available

HT95C300/30P: PE3~PE0 output are available

SPD0

Supported for HT95C400/40P, HT95C300/30P

Bit value is 0: SEG39~SEG36 output are available

Bit value is 1: PD3~PD0 output are available

SPD1

Supported for HT95C400/40P, HT95C300/30P

Bit value is 0: SEG43~SEG40 output are available

Bit value is 1: PD7~PD4 output are available

LCDIO (28H) Register

HT95CXXX

Rev. 1.50

May 26, 2005

LCD Driver

The LCD driver can directly drive an LCD panel with 1/8

duty and 1/4 bias or with 1/16 duty and 1/5 bias, this

function is selected by the flag VBIAS. The frame of this

LCD driver may select a 64Hz or 128Hz by flag FRAME.

LCD driver uses the voltage of the VLCD pin as the

power source. To adjust the view angle, the programmer

can select the real LCD power by the flags VCON0 and

VCON1. The flag LCDON is used to turn On/Off the LCD

display. Note that the VLCD voltage must equal or be

less than VDD.

Segment/Common to I/O Selection

For the flexible purpose, some of the LCD COMMON

and SEGMENT pins are shared with the input/output

port.

Both of the HT95C400/40P and HT95C300/30P provide

12 pins to be selected to SEGMENT output pins or I/O

pins. HT95C200/20P provides 8 pins to be selected for

COMMON output pins or I/O pins.

All of the HT95C400/40P, HT95C300/30P and

HT95C200/20P provide the LCD COMMON output pins

for 8 COMMON or 16 COMMON. The description of the

relation between segment pins, common pins and I/O

pins are shown on the below.

HT95C20P Datasheet(PDF) 31 Page - Holtek Semiconductor Inc

HT95C20P Datasheet(HTML) 31 Page - Holtek Semiconductor Inc

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