Lcd Operation Setup (1/4 Duty) - Panasonic MN101L Series User Manual

17.4.8

LCD Operation Setup (1/4 duty)

LCD Operation Setup Example (1/4 duty)
The following example is to display "23" on a 8-segment type LCD panel (two digits) through segment pins,
SEG0 to SEG3 and common pins, COM0 to COM3 with 1/4 duty and 1/3 bias, supplied from external voltage
divider.
Other conditions are described as follows;
HCLK: 4 MHz, LCD display clock: HCLK/2
Setup Procedure
(1) Stop the LCD.
LCDMD2 (0x03E82)
bp7: LCEN = 0
(2) Set a display duty.
LCDMD2 (0x03E82)
bp2-0: LCDDTY2-0 = 011
(3) Set a display clock.
LCDMD3 (0x03E83)
bp6-3: LCCK3-0 = 0100
bp2-0: LCCKS2-0 = 101
(4) Set Segment and common output pins.
LCCTR0 (0x03E86)
bp7-4: SEGSL3-0 = 1111
bp3-0: COMSL3-0 = 1111
LCCTR1 (0x03E87)
bp3-0: SEGSL7-4 = 1111
LCDSEL (0x03E8E)
bp3-0: COMSL7-4 = 0000
(5) Set the display data.
LCDATA0 (0x03E90) = 0x0E
LCDATA1 (0x03E91) = 0x05
LCDATA2 (0x03E92) = 0x0C
LCDATA3 (0x03E93) =0x07
(6) Activate the LCD.
LCDMD2 (0x03E82)
bp7: LCEN = 1
15
(122 Hz), LCD frame frequency: 31 Hz
(1) Stop the LCD.
(2) Set the operation mode to 1/4 duty driving.
15
(3) Select "HCLK/2 " as a display clock.
(4) Select SEG0-3 and COM0-3 pins.
(5) Set the display data "23" on the segment output latch.
(6) Start the LCD.
Description
LCD Display Examples
Chapter 17
LCD
XVII - 37