ATMEGA169L-8MI Atmel, ATMEGA169L-8MI Datasheet - Page 210

• Manufacturer Part Number: ATMEGA169L-8MI
• Description: IC MCU AVR 16K LV 8MHZ IND 64QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA169L-8MI

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SPI, UART/USART, USI
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 53
• Program Memory Size: 16KB (8K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-MLF®, 64-QFN
• For Use With: ATAVRISP2 - PROGRAMMER AVR IN SYSTEMATAVRBFLY - KIT EVALUATION AVR BUTTERFLYATSTK502 - MOD EXPANSION AVR STARTER 500
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: ATMEGA169L-4MI; ATMEGA169L-4MI

LCD Controller
Features
Overview
Definitions
210
ATmega169V/L
The LCD Controller/driver is intended for monochrome passive liquid crystal display
(LCD) with up to four common terminals and up to 25 segment terminals.
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A simplified block diagram of the LCD Controller/Driver is shown in Figure 96. For the
actual placement of I/O pins, refer to “Pinout ATmega169” on page 2.
An LCD consists of several segments (pixels or complete symbols) which can be visible
or non visible. A segment has two electrodes with liquid crystal between them. When a
voltage above a threshold voltage is applied across the liquid crystal, the segment
becomes visible.
The voltage must alternate to avoid an electrophoresis effect in the liquid crystal, which
degrades the display. Hence the waveform across a segment must not have a DC-
component.
Several terms are used when describing LCD. The definitions in Table 1 are used
throughout this document.
Table 93. Definitions
LCD
Segment
Common
Duty
Bias
Frame Rate
Display Capacity of 25 Segment and Four Common Terminals
Latching of Display Data gives Full Freedom in Register Update
Support Static, 1/2, 1/3 and 1/4 Duty
Support Static, 1/2, 1/3 Bias
Display Possible in Power-save Mode for Low Power Consumption
Low Power Waveform Software Selectable
Flexible Selection of Frame Frequency
Software Selection between System Clock or an External Asynchronous Clock Source
On-chip LCD Power Supply, only One External Capacitor needed
LCD Output Voltage (Contrast) Software Selectable from 2.6 to 3.35V for V
Operating Range
Equal Source and Sink Capability to Increase LCD Life Time
LCD Interrupt Can be Used for Display Data Update or Wake-up from Sleep Mode
Segment and Common Pins not Needed for Driving the Display Can be Used as Ordinary
I/O Pins
A passive display panel with terminals leading directly to a segment
The least viewing element (pixel) which can be on or off
Denotes how many segments are connected to a segment terminal
1/(Number of common terminals on a actual LCD display)
1/(Number of voltage levels used driving a LCD display -1)
Number of times the LCD segments is energized per second.
CC
2514H–AVR–05/03
in the Entire