HT95C30P datasheet(30/50 Pages) HOLTEK

30 / 50 page

HT95C200/20P/300/30P

Rev. 0.10

October 1, 2002

Preliminary

Label

Bits

R/W

Function

LCDC

(2DH)

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, COM0~COM15 are available

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

When the 8 COM is selected

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

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

LBEN

Low battery detection switch

0: disable the low battery detection

1: enable the low battery detection

3RO

Unused bit, read as

²0²

LBFG

Low battery detection flag

1: LBIN pin voltage is less than 1.25V

0: LBIN pin voltage is not less than 1.25V

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

LCDIO

(28H)

0~4

Unused bit, read as

²0²

SPE0

For HT95C300/30P only

0: SEG44~SEG47 pins are LCD segment output

1: SEG44~SEG47 pins are PE0~PE3 pins

SPD0

For HT95C300/30P only

0: SEG36~SEG39 pins are LCD segment output

1: SEG36~SEG39 pins are PD0~PD3 pins

SPD1

For HT95C300/30P only

0: SEG40~SEG43 pins are LCD segment output

1: SEG40~SEG43 pins are PD4~PD7 pins

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 and VDD2.

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. HT95C300/30P provides 12 pins to be selected to

SEGMENT output pins or I/O pins. HT95C200/20P pro-

vides 8 pins to be selected for COMMON output pins or

I/O pins.

Both of the HT95C300/30P and HT95C200/20P provide

the LCD COMMON output pins for 8 COMMON or 16

COMMON. The description of the relation between seg-

ment pins, common pins and I/O pins are shown on the

next page.

HT95C30P Datasheet(PDF) 30 Page - Holtek Semiconductor Inc

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