ters. Each PWM " />
參數(shù)資料
型號: 101-0552
廠商: Rabbit Semiconductor
文件頁數(shù): 33/138頁
文件大?。?/td> 0K
描述: KIT DEV RABBITCORE/RCM3200
標準包裝: 1
系列: RabbitCore 3000
類型: MPU 模塊
適用于相關產(chǎn)品: RCM3200
所含物品: RabbitCore 模塊、開發(fā)板、交流適配器、纜線和 Dynamic C? 光盤
產(chǎn)品目錄頁面: 620 (CN2011-ZH PDF)
其它名稱: 316-1023
122
RabbitCore RCM3200
E.4 PWM Outputs
The Pulse-Width Modulator consists of a 10-bit free-running counter and four width regis-
ters. Each PWM output is high for n + 1 counts out of the 1024-clock count cycle, where n
is the value held in the width register. The PWM output high time can optionally be spread
throughout the cycle to reduce ripple on the externally filtered PWM output. The PWM is
clocked by the output of Timer A9. The spreading function is implemented by dividing
each 1024-clock cycle into four quadrants of 256 clocks each. Within each quadrant, the
Pulse-Width Modulator uses the eight MSBs of each pulse-width register to select the base
width in each of the quadrants. This is the equivalent to dividing the contents of the pulse-
width register by four and using this value in each quadrant. To get the exact high time, the
Pulse-Width Modulator uses the two LSBs of the pulse-width register to modify the high
time in each quadrant according to Table E-3 below. The “n/4” term is the base count, and
is formed from the eight MSBs of the pulse-width register.
The diagram below shows a PWM output for several different width values for both
modes of operation. Operation in the spread mode reduces the filtering requirements on
the PWM output in most cases.
Figure E-1. PWM Outputs for Various Normal and Spread Modes
Table E-3. PWM Outputs
Pulse Width LSBs
1st
2nd
3rd
4th
00
n/4 + 1
n/4
01
n/4 + 1
n/4
n/4 + 1
n/4
10
n/4 + 1
n/4
11
n/4 + 1
n=255, normal
n=256, spread
n=255, spread
(256 counts)
(64 counts)
(65 counts)
(64 counts)
(64 counts)
(64 counts)
n=257, spread
(65 counts)
(64 counts)
(65 counts)
(64 counts)
n=258, spread
(65 counts)
(64 counts)
n=259, spread
(65 counts)
n=259, normal
(260 counts)
相關PDF資料
PDF描述
VI-JTM-EZ CONVERTER MOD DC/DC 10V 25W
VI-JTJ-EZ CONVERTER MOD DC/DC 36V 25W
REC3-4805DRWZ/H4/C CONV DC/DC 3W 18-72VIN +/-05VOUT
REC3-4805DRWZ/H4/A CONV DC/DC 3W 18-72VIN +/-05VOUT
REC3-243.3DRWZ/H6/C CONV DC/DC 3W 9-36VIN +/-3.3VOUT
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101-0553 功能描述:KIT DEV RABBIT RCM3200 INTL RoHS:否 類別:編程器,開發(fā)系統(tǒng) >> 通用嵌入式開發(fā)板和套件(MCU、DSP、FPGA、CPLD等) 系列:RabbitCore 3000 標準包裝:1 系列:PICDEM™ 類型:MCU 適用于相關產(chǎn)品:PIC10F206,PIC16F690,PIC16F819 所含物品:板,線纜,元件,CD,PICkit 編程器 產(chǎn)品目錄頁面:659 (CN2011-ZH PDF)