//-----------------------------------------------------------------------------
//?F41x_ADC0_ExternalInput.c
//-----------------------------------------------------------------------------
//?Copyright?2006?Silicon?Laboratories?Inc.
//?http://www.silabs.com
//
//?Program?Description:
//?--------------------
//
//?This?example?code?takes?and?averages?2048?analog?measurements?from?input
//?P1.1?using?ADC0?then?prints?the?results?to?a?terminal?window?via?the?UART.
//
//?The?system?is?clocked?by?the?internal?24.5MHz?oscillator.??Timer?2?triggers
//?a?conversion?on?ADC0?on?each?overflow.??The?completion?of?this?conversion
//?in?turn?triggers?an?interrupt?service?routine?（ISR）.??The?ISR?averages
//?2048?measurements?then?prints?the?value?to?the?terminal?via?printf?before
//?starting?another?average?cycle.
//
//?The?analog?multiplexer?selects?P1.1?as?the?positive?ADC0?input.??This
//?port?is?configured?as?an?analog?input?in?the?port?initialization?routine.
//?The?negative?ADC0?input?is?connected?via?mux?to?ground?which?provides
//?for?a?single-ended?ADC?input.
//
//?A?100kohm?potentiometer?may?be?connected?as?a?voltage?divider?between
//?VREF?and?AGND?on?the?terminal?strip?as?shown?below:
//
//?---------
//??????????|
//?????????o|?VREF?----|
//?????????o|?GND???---|<-|
//?????????o|?P1.1?????|??|
//?????????o|????|????????|
//?????????o|?????--------
//?????????o|
//??????????|
//----------
//?C8051F410-TB
//
//?Terminal?output?is?done?via?printf?which?directs?the?characters?to
//?UART0.??A?UART?initialization?routine?is?therefore?necessary.
//
//?ADC?Settling?Time?Requirements?Sampling?Rate:
//?----------------------------------------------
//
//?The?total?sample?time?per?input?is?comprised?of?an?input?setting?time
//?（Tsettle）?followed?by?a?conversion?time?（Tconvert）:
//
//?Tsample??=?Tsettle?+?Tconvert
//
//?|--------Settling-------|==Conversion==|----Settling---?.?.?.
//?Timer?2?overflow????????^
//?ADC0?ISR???????????????????????????????^
//
//?The?ADC?input?voltage?must?be?allowed?adequate?time?to?settle?before?the
//?conversion?is?made.??This?settling?depends?on?the?external?source
//?impedance?internal?mux?impedance?and?internal?capacitance.
//?Settling?time?is?given?by:
//
//???????????????????|?2^n?|
//????Tsettle?=???ln?|?---?|?*?Rtotal?*?Csample
//???????????????????|?SA??|
//
//?In?this?application?assume?a?100kohm?potentiometer?as?the?voltage?divider.
//?The?expression?evaluates?to:
//
//???????????????????|?2^10?|
//????Tsettle?=???ln?|?----?|?*?105e3?*?5e-12?=?4.4uS
//???????????????????|?0.25?|
//
//?In?addition?one?must?allow?at?least?1.5uS?after?changing?analog?mux
//?inputs?or?PGA?settings.??The?settling?time?in?this?example?then?is
//?dictated?by?the?large?external?source?resistance.
//
//?The?conversion?is?10?periods?of?the?SAR?clock?.??At?3?MHz
//?this?time?is?10?*?400nS?=?3.3?uS.
//
//
//?Tsample?minimum??=?Tsettle?+?Tconvert
//

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件??????13241??2010-07-20?13:25??C8051F41x\ADC\F41x_ADC0_ExternalInput.c

?????文件??????20344??2010-07-20?13:25??C8051F41x\ADC\F41x_ADC0_ExternalInput_Mux.c

?????文件??????16320??2010-07-20?13:26??C8051F41x\blinky\c8051F410.h

?????文件??????14349??2010-07-20?13:26??C8051F41x\blinky\C8051F410.INC

?????文件??????18885??2010-07-20?13:26??C8051F41x\blinky\C8051F410_defs.h

?????文件???????2796??2010-07-20?13:25??C8051F41x\blinky\F41x_blinky.asm

?????文件???????5700??2010-07-20?13:25??C8051F41x\blinky\F41x_blinky.c

?????文件??????47052??2010-07-20?13:25??C8051F41x\blinky\F41x_blinky_Asm.wsp

?????文件??????47002??2010-07-20?13:25??C8051F41x\blinky\F41x_blinky_C.wsp

?????文件???????8414??2010-07-20?13:25??C8051F41x\Comparators\F41x_Comparator0_ResetSource.c

?????文件??????12575??2010-07-20?13:25??C8051F41x\DAC\F41x_DACs_SineCosine.c

?????文件??????16320??2010-07-20?13:26??C8051F41x\Header_Files\c8051F410.h

?????文件??????14349??2010-07-20?13:26??C8051F41x\Header_Files\C8051F410.INC

?????文件??????18885??2010-07-20?13:26??C8051F41x\Header_Files\C8051F410_defs.h

?????文件???????7044??2010-07-20?13:25??C8051F41x\Interrupts\F41x_External_Interrupts.c

?????文件???????9474??2010-07-20?13:25??C8051F41x\Oscillators\F41x_Clock_Multiplier.c

?????文件???????5763??2010-07-20?13:25??C8051F41x\Oscillators\F41x_Oscillator_Capacitor.c

?????文件???????9031??2010-07-20?13:25??C8051F41x\Oscillators\F41x_Oscillator_CMOS.c

?????文件???????5880??2010-07-20?13:25??C8051F41x\Oscillators\F41x_Oscillator_Crystal.c

?????文件???????5856??2010-07-20?13:25??C8051F41x\Oscillators\F41x_Oscillator_RC.c

?????文件??????17906??2010-07-20?13:25??C8051F41x\Oscillators\F41x_RTC_Suspend.c

?????文件??????10500??2010-07-20?13:25??C8051F41x\PCA\F41x_PCA0_16Bit_PWM_Output.c

?????文件???????8402??2010-07-20?13:25??C8051F41x\PCA\F41x_PCA0_8Bit_PWM_Output.c

?????文件??????11095??2010-07-20?13:25??C8051F41x\PCA\F41x_PCA0_Capture_Input.c

?????文件???????6564??2010-07-20?13:25??C8051F41x\PCA\F41x_PCA0_Frequency_Output.c

?????文件???????9636??2010-07-20?13:25??C8051F41x\PCA\F41x_PCA0_High_Speed_Output.c

?????文件??????10426??2010-07-20?13:25??C8051F41x\PCA\F41x_PCA0_Software_Timer_blinky.c

?????文件???????6773??2010-07-20?13:25??C8051F41x\PortIO\F41x_PortMatch.c

?????文件???????5920??2010-07-20?13:25??C8051F41x\PortIO\F41x_Ports_SwitchesLEDs.c

?????文件??????29740??2010-07-20?13:25??C8051F41x\SMBus\F41x_SMBus_EEPROM.c

............此處省略36個文件信息