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14 Pages

ch4-4

Course: EE 464, Fall 2009
School: Princeton
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Word Count: 465

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embedded The systems platform Example:alarmclock 2000 Morgan Kaufman Overheads for Computers as Components Alarm clock interface Alarm on PM Alarm off buzzer light set time 2000 Morgan Kaufman Alarm ready set alarm hour minute button Overheads for Computers as Components Operations Settime:holdsettime,depresshour, minute. Setalarmtime:holdsetalarm,depress hour,minute....

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embedded The systems platform Example:alarmclock 2000 Morgan Kaufman Overheads for Computers as Components Alarm clock interface Alarm on PM Alarm off buzzer light set time 2000 Morgan Kaufman Alarm ready set alarm hour minute button Overheads for Computers as Components Operations Settime:holdsettime,depresshour, minute. Setalarmtime:holdsetalarm,depress hour,minute. Turnalarmon/off:depressalarmon/off. 2000 Morgan Kaufman Overheads for Computers as Components Alarm clock requirements name purpose inputs outputs functions alarmclock 24hourdigitalclockwithonealarm settime,setalarm,hour,minute,alarmon/ off fourdigitdisplay,PMindicator,alarmready,buzzer keeptime,settime,setalarm,turnalarmon/ off, activatebuzzerbyalarm performance hoursanddigits,noseconds;nothighprecision manufacturing consumerproduct cost power AC physical fitsonstand size/ weight 2000 Morgan Kaufman Overheads for Computers as Components Alarm clock class diagram 1 Lights* 1 Display 1 1 Buttons* Speaker* 1 Mechanism 1 1 1 2000 Morgan Kaufman Overheads for Computers as Components Alarm clock physical classes Lights* Buttons* set-time(): boolean set-alarm(): boolean alarm-on(): boolean alarm-off(): boolean minute(): boolean hour(): boolean Speaker* digit-val() digit-scan() alarm-on-light() PM-light() buzz() 2000 Morgan Kaufman Overheads for Computers as Components Display class Display time[4]: integer alarm-indicator: boolean PM-indicator: boolean set-time() alarm-light-on() alarm-light-off() PM-light-on() PM-light-off() 2000 Morgan Kaufman Overheads for Computers as Components Mechanism class Mechanism Seconds: integer PM: boolean tens-hours, ones-hours: integer tens-minutes, ones-minutes: integer alarm-ready: boolean alarm-tens-hours, integer alarm-ones-hours: alarm-tens-minutes, alarm-ones-minutes: integer scan-keyboard() update-time() 2000 Morgan Kaufman Overheads for Computers as Components Update-time behavior update seconds with rollover Rollover? F Time >= alarm and alarm-on? T alarm.buzzer(true) display.set-time(current time) F T update hh:mm with rollover AM->PM PM=true 2000 Morgan Kaufman PM->AM PM=false Overheads for Computers as Components Scan-keyboard behavior compute button activations alarm-ready= true Alarm-on Alarm-off save button states Set-time and not set-alarm and hours Increment time tens w. rollover and AM/PM Increment time ones w. rollover and AM/PM Set-time and not set-alarm and minutes alarm-ready= false alarm.buzzer(false) 2000 Morgan Kaufman Overheads for Computers as Components System architecture Includes: periodicbehavior(clock); aperiodicbehavior(buttons,buzzer activation). Twomajorsoftwarecomponents: interruptdrivenroutineupdatestime; foregroundprogramdealswithbuttons, commands. 2000 Morgan Kaufman O...

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U. Houston - SERVER - 2009041706
2 REAL 9 4 16 18 0 REAL 9 4 16 18 0 12BACKWARDOMEGA 9 4 17 6 29.696 -95.499 1000.0 9 4 17 6 29.670 -95.129 1000.0 9 4 17 6 30.039 -94.075 10
Princeton - EE - 464
Networks Networkbaseddesign. Communicationanalysis. Systemperformanceanalysis. Internetenabledsystems. 2000 Morgan KaufmanOverheads for Computers as ComponentsCommunication analysis First,understanddelayforsingle message. Delayformultipl
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18-38. The heat needed is found by integrating the heat capacity:Tf TfQ=Ticm dT = mTi 15.0 Cc dT= = =(2)5.0 C(0.20 + 0.14T + 0.023T 2) dT15.0(2.0)(0.20T + 0.070T 2 + 0.00767T 3)5.0(cal)81.8 cal .18-39. (a) We work in Celsi
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2.5 2 1.5 1 0.5246810
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