Panasonic MN101L Series

Chapter 17
LCD
LCD Display Examples XVII - 31
17.4.4 LCD Operation Setup (1/2 duty)
The following example is to display "23" on a 8-segment type LCD panel (two-digit display) through segment
pins, SEG0 to SEG7 and common pins, COM0 to COM1 with 1/2 duty and 1/2 bias, supplied from external volt-
age divider.
The specific details are as follows;
HCLK: 4 MHz, LCD display clock: HCLK/2
15
(122 Hz), LCD frame frequency: 61 Hz
Setup Procedure Description
(1) Stop the LCD.
LCDMD2 (0x03E82)
bp7: LCEN = 0
(1) Stop the LCD.
(2) Set a display duty.
LCDMD2 (0x03E82)
bp2-0: LCDDTY2-0 = 001
(2) Set the operation mode to 1/2 duty driving.
(3) Set a display clock.
LCDMD3 (0x03E83)
bp6-3: LCCK3-0 = 0100
bp2-0: LCCKS2-0 = 101
(3) Select "HCLK/2
15
" as a display clock.
(4) Set Segment and common output pins.
LCCTR0 (0x03E86)
bp7-4: SEGSL3-0 = 1111
bp1-0: COMSL1-0 = 11
LCCTR1 (0x03E87)
bp3-0: SEGSL7-4 = 1111
LCDSEL (0x03E8E)
bp3-0: COMSL7-4 = 0000
(4) Select SEG0-7 and COM0-1 pins.
(5) Set the display data.
LCDATA0 (0x03E90) = 0x01
LCDATA1 (0x03E91) = 0x03
LCDATA2 (0x03E92) = 0x02
LCDATA3 (0x03E93) = 0x02
LCDATA4 (0x03E94) = 0x00
LCDATA5 (0x03E95) = 0x03
LCDATA6 (0x03E96) = 0x02
LCDATA7 (0x03E97) = 0x03
(5) Set the display data "23" on the segment output latch.
(6) Activate the LCD.
LCDMD2 (0x03E82)
bp7: LCEN = 1
(6) Start the LCD operation.