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Ãö©ó Curiosity pic32mx470 ªºÀW²v³]©w»PPWM°T¸¹
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2015/12/28 16:20
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Ãö©óÀW²v³]©wªº°ÝÃD¡A§Ú¨Ï¥ÎMCC :
³]©wSystem Module
1. Internal Oscillator³]©w¬O 20MHz ¬° Primary Oscillator Clock Source

2. PLL Enable
4MHz "5xDivider" PLL input
80MHz "20:1" Multiplier
80MHz "1:1" Divider

Peripheral Clock Divisor "DV_1"

80MHz SYSCLK
80MHz PBCLK

±q Easy Setup »P Registers ¸Ì­±¬Ý³]©w³£¨S¦³°ÝÃD

TMR2 ¤¶­±³]©w OC4 ¤¶­±³]©w :
Timer Clock : Compare Mode :

Clock Source "PBCLK" Dual Compare Countinuous Pulse mode
Input frequency "80MHz" Buffer Mode "16bit"
Prescaler "1:1" Timerbase "TMR2"

Timer Period :

period count "0x64"
Timer Period "1.25us"

¥H¤W³]©w¬O§Ú¨Ì¾Ú Datasheet ´£¨Ñªº¤º®e³]©w§Úªº»Ý¨D¡APWM°T¸¹¤]¨Ì¾Ú´£¨Ñªº¤½¦¡­pºâ¹L¡C

°ÝÃD¬O¦b¥Üªi¾¹Åã¥ÜªºPeriod«o¬O 2.525us ¥ª¥k

§Ú¯à½T©w¤£¬O¥Üªi¾¹ªº°ÝÃD¡A¦]¬°¦b¥H¤W¬Û¦Pªº³]©w¤U¡G
§Ú§âInternal Oscillator³]©w¬° 10MHz ®É¡A¿é¥Xperiod¥ç¬°¹w´Áªº1.25us¡A­pºâªº PR2 ¤]¦p³]©w¤Wªº Period Count (0x32) ¬Ûµ¥¡C

¥u¬OÅÜ°Ê Internal Oscillator ¬°¦ó¿é¥Xperiod·|²£¥Í2­¿ªº®t²§??

½Ð°Ý¬O¦ó³B¼vÅT¤Fµ²ªG??

·PÁ«ü±Ð¡C

2018/06/27 10:21
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Re: Ãö©ó Curiosity pic32mx470 ªºÀW²v³]©w»PPWM°T¸¹
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2015/12/28 16:20
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¥u­n§ó°ÊClock source (Primary Oscillator) ªº¼Æ­È¡A¸g¹LMultiplier¡BDivider¡BPeripheral Clock Divisor ­¿ÀW°£ÀW«á¡A§Y«KPBCLK ©M PR2 ¼Æ­È¨S¦³§ó°Ê¡A¿é¥Xªº PWM Period ÁÙ¬O·|¦³ÅܤơC

¨Ò¦p :
Clock Source = 20MHz , PBCLK = 80MHz , PR2 = 100(0x64) ; ¥Üªi¾¹¤W¬Ý¨ìªº¬O2.526us

Clock Source = 40MHz , PBCLK = 80MHz , PR2 = 100(0x64) ; ¥Üªi¾¹¤W¬Ý¨ìªº¬O5.049us

¨Ì¾Ú PIC32RefManual-Dec2013 ¸ê®Æ´£¨ÑªºPWM­pºâ¤½¦¡¡A²z½×µ²ªG³£¨S¦³°ÝÃD¡A¦ý¬O¹ê»ÚÅã¥Ü¦b¥Üªi¾¹¤W¦³°ÝÃD¡C


½Ð°Ý¬O­þ¸Ì¥X°ÝÃD©Î¬O§Ú·d¿ù¤F¤å¥óªº·N«ä¶Ü?

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2018/07/16 16:40
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Re: Ãö©ó Curiosity pic32mx470 ªºÀW²v³]©w»PPWM°T¸¹
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¨Sªþ¹Ï¤]¨S¬Ý¨ì¯u¹ê(¹êÅç)ªºª¬ªp...

²q¤@¤U,¥i¯à¦X²zªº­ì¦]

§â¨ä¥L¤£Åܳ£¥h°£«á,¥u³Ñ¥|­Ó¼Æ¦r
20MHz, 2.526us
40MHz, 5.049us
¨ä¤¤
40MHz»P20MHz¬O¨â­¿»P1/2Ãö«Y
2.526us»P5.049us°ò¥»¤W¤]¬O¨â­¿»P1/2Ãö«Y
µù:2.526*2À³¸Ó¬O5.052, 5.049/2À³¸Ó¬O2.5245
°ò¥»¤W³o¬O¶q´ú»~®t½d³ò,¤£¼vÅT¨â­¿»P1/2Ãö«Y

±q³oùØ¥h¦^±À§äµª®×,¥i¯à·|§Ö¤@ÂI...

2018/07/17 10:48
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Re: Ãö©ó Curiosity pic32mx470 ªºÀW²v³]©w»PPWM°T¸¹
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2015/12/28 16:20
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Hi jason680 :

20MHz »P 40MHz ³£¬O Clock source(Primary oscillator)

¦ý¬O PWM ³]©w¤W¦Yªº¬O Timer2 ªº PBCLK ÀW²v ¡A ·Ó²z¨Ó»¡¿é¥XÀ³¸Ó¤£·|¨ü¼vÅT¡C

Clock source ¦^±Àªº¤è¦¡¥h·Q :

§Ú·Qªk²q´ú¬O¦]¬°«ü¥O¶g´Á (TOSC = 1/FOSC = TCY) ªºÃö«Y¡A¦ý¬OPIC32RefManual-Dec2013 ¸ê®Æ¤¤´£¨Ñªº¤½¦¡ :
PWM Period = [(PR + 1) • TPB • (TMR Prescale Value)]
(TPB = 1/PBCLK )

¨S¦³´£¨ì©M«ü¥O¶g´Á¦³Ãö¡A¦]¬°¦¹³B³]©wªº PBCLK ³£¬O¤@¼Ëªº¡A²£¥Í¨â­¿ªº®t²§¡A¤p§Ì¤£¸Ñ¦ó­ì¦]¤Î­ì²z·§©À¡C

©Î³\¤]¬O¤p§Ì¦³¦a¤è¸ÑŪ¿ù»~¡AÁٽаª¤â«üÂI¡C

2018/07/17 11:44
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Re: Ãö©ó Curiosity pic32mx470 ªºÀW²v³]©w»PPWM°T¸¹
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2007/06/05 21:45
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½Ð°Ý¤@¤U,§A¦p¦ó½T»{µLÃöªº?

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jpg  pic32mx470_OSC.jpg (145.90 KB)
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2018/07/17 19:43
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Re: Ãö©ó Curiosity pic32mx470 ªºÀW²v³]©w»PPWM°T¸¹
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2015/12/28 16:20
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Hi jason680 :

¦]¬°¦p¦P²Ä¤@«h©Ò»¡¡A§Ú¬O¨Ï¥Î :

System USB PLL > XTPLL,HSPLL,ECPLL,FRCPLL ¨«¶i¥hµ¹ PBCLK

°²³]¦p§Aµeªº¬õ½u¨ú¦V "Posc(XT,HS,EC)"¡A¨º¦b¨ä¥LªºSFR¸Ì´N¯à¬Ý¥X­È¤£¥¿½T¤]´N¬O±q :
OSCCON : bit 10-8 NOSC<2:0> , bit 14-12 COSC<2:0>

OSCCON = 0x53300 , Âà´««á¤]´N¬O 0101 0011 0011 0000 0000, ®Ú¾Ú¤W­zdatasheetµ¹ªº¹ï·Ó¤]¨S¦³°ÝÃD¡C

Á`µ²§Ú»{¬°¦YªºÀW²v¬O±q System USB PLL¥X¨Óªº¡A©Ò¥H§Ú¤£»{¬°¥L·|©M§A¹Ï©Òµeªº¤è¦¡¡A¦³¥ô¦óÃöÁp¡C

¦p¤p§Ì¦³Æ[©À¿ù»~¡A³Ò·ÐªÈ¥¿´£¿ô¡A·PÁ¡C

2018/07/18 09:56
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Re: Ãö©ó Curiosity pic32mx470 ªºÀW²v³]©w»PPWM°T¸¹
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2009/04/07 13:30
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³o¦ì¥S§Ì, ±z¦n!

´£¨Ñ¥H¤U¨Ñ§A¦A¦¸À˵ø§Aªº clock source Ãö«Y.



¿ï¾Ü XTPLL,HSPLL,ECPLL,FRCPLL ¨Ó¨Ï¥Î®É,

¨Ã¤£¬O System USB PLL ªº¿é¥X,

¦Ó¬O System PLL ªº¿é¥X, (¤è¶ô¹Ï¤¤¥i¥H§ä¨ì)



¤£ºÞ¬O System PLL ©Î USB PLL ,

¥Ñ¤è¶ô¹Ï¤¤Åã¥Ü, ¥u¦³2­Ó¨Ó·½¥i¨Ñ¿ï¥Î,

¤@­Ó¬O Primary Oscillator,

¥t¤@­Ó¬O FRC Oscillator,

ÅãµM§A¨Ã¤£¬O¿ï¥Î FRC Oscillator,

¨º»òÀ³¸Óªí¥Ü¥Ø«e System PLL »P USB PL

¬Ò¥H Primary Oscillator ¬°¿é¤J¨Ó·½.

2018/07/18 12:27
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Re: Ãö©ó Curiosity pic32mx470 ªºÀW²v³]©w»PPWM°T¸¹
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µù¥U¤é´Á:
2007/06/05 21:45
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¨º´Nµe±i¹Ï
¦AÀËÅç¤@¤U¹ï¿ù
°ò¥»´N¯à¸Ñ¨M°ÝÃD...

2018/07/18 13:01
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Re: Ãö©ó Curiosity pic32mx470 ªºÀW²v³]©w»PPWM°T¸¹
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2015/12/28 16:20
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HP : 0 / 43
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¦¹¹Ï¬O§Ú©Ò»¡ªº¨«¦V¡A³o¼Ë¬O¹ïªº¶Ü?

ªþ¥[ÀÉ®×:



jpg  oscillator.jpg (287.26 KB)
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2018/07/18 14:25
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Re: Ãö©ó Curiosity pic32mx470 ªºÀW²v³]©w»PPWM°T¸¹
¸ê²`·|­û
µù¥U¤é´Á:
2007/06/05 21:45
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¤å³¹: 1018
µ¥¯Å: 28; EXP: 20
HP : 0 / 680
MP : 339 / 23269
Â÷½u
ªA¤F,§Ú§ë­°»{¿é...

2018/07/18 15:32
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(1) 2 »



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