HT95C30P datasheet(23/42 Pages) HOLTEK

23 / 42 page

HT95L100/10P

Rev. 0.10

October 1, 2002

Preliminary

LCD driver

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

duty and 1/4 bias. The frame of this LCD driver is fixed

for 64Hz.

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 SEGMENT

pins are shared with the input/output port.

HT95L100/10P provides 4 pins to be selected to SEG-

MENT output pins or I/O pins.

LCD display memory

The phone controller provides an area on embedded

data memory for LCD display. The LCD display memory

are located at bank 1BH and can be read and written to,

only by indirect addressing mode using MP1. When

data is written into the display data area it is automati-

cally read by the LCD driver which then generates the

corresponding LCD driving signals, to turn the display

On or Off, a

²1² or ²0² is written to the corresponding bit

of the display memory, respectively. All of the LCD dis-

play memories are with random values after the power

on reset and unchanged after other reset conditions.

Label

Bits

R/W

Function

LCDC

(2DH)

LBEN

Low battery detection switch

0: disable the low battery detection

1: enable the low battery detection

3,1,0

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)

4~0

7~6

Unused bit, read as

²0²

SPE0

0: SEG16~SEG19 pins are LCD segment output

1: SEG16~SEG19 pins are PE0~PE3 pins

COM7 to COM0 for HT95L100/10P

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

8CH

SEG0

COM7

COM6

COM5

COM4

COM3

COM2

COM1

COM0

8DH

SEG1

COM7

COM6

COM5

COM4

COM3

COM2

COM1

COM0

¾¾

COM7

COM6

COM5

COM4

COM3

COM2

COM1

COM0

9EH

SEG18

COM7

COM6

COM5

COM4

COM3

COM2

COM1

COM0

9FH

SEG19

COM7

COM6

COM5

COM4

COM3

COM2

COM1

COM0

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