User`s manual

ENDAT-K1001 USERS MANUAL

UNICORN COMPUTER CORP.

2-6. LCD Backlight ON/OFF Control

1) Inverter Power/ON/OFF Signal level select:

I-PWR1 (Pin2, 4, 6): LCD Backlight Voltage Select (2x3 with 2.0mm)

Voltage +5V +12V *

I-PWR1 4-6 2-4

I-PWR1 (Pin1, 3, 5): Inverter ON/OFF Level Select (2x3 with 2.0mm)

Voltage +3.3V * +5V

I-PWR1 1-3 3-5

2) Backlight ON/OFF Control port address:

This is alternate function with VBIOS (VESA) to offering an easy way to control

the LCD backlight ON and OFF as need. Please follow the instructions of

below for more detail in operation.

Sample code for backlight on/off control (using Turbo C/C++ 3.0):

#define input_port 0xf40

outportb(0x2e,0x87); // Unlock register

outportb(0x2e,0x01); // Unlock register

outportb(0x2e,0x55); // Unlock register

outportb(0x2e,0x07); // Set Logic Device number pointer

outportb(0x2f,0x07); // Set Logic Device number

outportb(0x2e,0x25); // Set Multi-Function Pin for GPIO Set1

outportb(0x2f,0x10); // GP10~17 (Default 01)

outportb(0x2e,0x2A); // Set Ext Multi-Function Pin

outportb(0x2f,0x10); // Set Bit 1: GPIO / 0:PCIRST

outportb(0x2e,0xC0); // Set Enable Simple GPIO

outportb(0x2f,0x10); // GP10~17 (Default 01)

outportb(0x2e,0xB0); // Set GPIO Pin Polarity

outportb(0x2f,0x10); // GP10~17(Default 00) 1:Inverting/0: Non-Inverting

outportb(0x2e,0xC8); // Set GPIO Input Mode / Output Mode

outportb(0x2f,0x10); // 0: Inputer ; 1: Output (Default 00)

outportb(0xf40,0xnn); // Set active register is IO Base Address 0F40 “default 2F”

// ; bit4 = 0h  Backlight On

// ; bit4 = 1  Backlight Off

Bit No 7 6 5 4 3 2 1 0

Map

NA NA NA

BKL CTRL

NA NA NA NA