欢迎访问ic37.com |
会员登录 免费注册
发布采购

ATMEGA169PV 参数 Datasheet PDF下载

ATMEGA169PV图片预览
型号: ATMEGA169PV
PDF下载: 下载PDF文件 查看货源
内容描述: 微控制器,带有16K字节的系统内可编程闪存 [Microcontroller with 16K Bytes In-System Programmable Flash]
分类和应用: 闪存微控制器
文件页数/大小: 390 页 / 3485 K
品牌: ATMEL [ ATMEL ]
 浏览型号ATMEGA169PV的Datasheet PDF文件第229页浏览型号ATMEGA169PV的Datasheet PDF文件第230页浏览型号ATMEGA169PV的Datasheet PDF文件第231页浏览型号ATMEGA169PV的Datasheet PDF文件第232页浏览型号ATMEGA169PV的Datasheet PDF文件第234页浏览型号ATMEGA169PV的Datasheet PDF文件第235页浏览型号ATMEGA169PV的Datasheet PDF文件第236页浏览型号ATMEGA169PV的Datasheet PDF文件第237页  
ATmega169P  
22. LCD Controller  
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.  
22.1 Features  
Display Capacity of 25 Segments and Four Common Terminals  
Support Static, 1/2, 1/3 and 1/4 Duty  
Support Static, 1/2, 1/3 Bias  
LCD Output Voltage (Contrast) Software Selectable from 2.6 to 3.35V for VCC in the Entire  
Operating Range  
On-chip LCD Power Supply, only One External Capacitor needed  
Display Possible in Power-save Mode for Low Power Consumption  
Software Selectable Low Power Waveform Capability  
Flexible Selection of Frame Frequency  
Software Selection between System Clock or an External Asynchronous Clock Source  
Equal Source and Sink Capability to maximize 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  
Latching of Display Data gives Full Freedom in Register Update  
22.2 Overview  
A simplified block diagram of the LCD Controller/Driver is shown in Figure 22-1. For the actual  
placement of I/O pins, see ”Pinout ATmega169P” 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.  
The PRLCD bit in ”PRR – Power Reduction Register” on page 44 must be written to zero to  
enable the LCD module.  
22.2.1  
Definitions  
Several terms are used when describing LCD. The definitions in Table 22-1 are used throughout  
this document.  
Table 22-1. Definitions  
LCD  
A passive display panel with terminals leading directly to a segment  
The least viewing element (pixel) which can be on or off  
Segment  
Common  
Duty  
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.  
Bias  
Frame Rate  
233  
8018A–AVR–03/06  
 复制成功!