HT45F43 datasheet(97/152 Pages) HOLTEK

97 / 152 page

LCD Bias Control

The LCD COM driver enables two kinds of selection to be provided to suit the requirement of the LCD

panel which is being used. The bias resistor choice is implemented using the ISEL bit in the LCDC

LCDC Register

Bit

76543210

Name

LCDBUF

ISEL

LCDEN

COM3EN

COM2EN

COM1EN

COM0EN

R/W

POR

0000000

Bit 7

unimplemented, read as

²0²

Bit 6

LCDBUF: LCD buffer control bit

0: disable

1: enable

Bit 5

ISEL: SCOM operating current selection (VDD=5V)

0: 10uA

1: 25uA

Bit 4

LCDEN: LCD control bit

0: disable

1: enable

The SCOMn can be enable by COMnEN if LCDEN=1.

Bit 3

COM3EN: PC6 or SCOM3 selection

0: GPIO

1: SCOM3

Bit 2

COM2EN: PC5 or SCOM2 selection

0: GPIO

1: SCOM2

Bit 1

COM1EN: PC4 or SCOM1 selection

0: GPIO

1: SCOM1

Bit 0

COM0EN: PA0 or SCOM0 selection

0: GPIO

1: SCOM0

Note:

This device provides the LCD buffer function, which is controlled by LCDBUF flag, to prevent the interference

from LCD panel. With this buffer, that will provide more stable reference voltages, VH0/1, VL0/1, for OPA and

Comparator. It should be noted that if the LCD SCOM power supply is selected from VLDO or if the LCD panel

has larger size, than the LCD buffer should be turned on to have a higher driver current. However, that will

cause more power consumption to turn on this buffer.

HT45F23/HT45F43

8-Bit Flash MCU with Op Amps & Comparators

Rev. 1.20

September 15, 2011

HT45F43 데이터시트(PDF) 97 Page - Holtek Semiconductor Inc

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