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参数资料
型号： 101-0523
厂商： Rabbit Semiconductor
文件页数： 118/128页
文件大小： 0K
描述： KIT DEV RABBIT3000/RCM3000
标准包装： 1
系列： RabbitCore 3000
类型： MPU 模块
适用于相关产品： RCM3000
所含物品： RabbitCore 模块、开发板、交流适配器、缆线和 Dynamic C? 光盘
其它名称： 316-1017
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.
Table E-3. PWM Outputs
00
01
10
11
Pulse Width LSBs
1st
n /4 + 1
n /4 + 1
n /4 + 1
n /4 + 1
2nd
n /4
n /4
n /4 + 1
n /4 + 1
3rd
n /4
n /4 + 1
n /4 + 1
n /4 + 1
4th
n /4
n /4
n /4
n /4 + 1
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.
n=255, normal
(256 counts)
n=255, spread
n=256, spread
n=257, spread
n=258, spread
n=259, spread
(64 counts)
(65 counts)
(65 counts)
(65 counts)
(65 counts)
(64 counts)
(64 counts)
(64 counts )
(65 counts)
(65 counts)
(64 counts)
(64 counts )
(65 counts)
(65 counts)
(65 counts)
(64 counts)
(64 counts)
(64 counts)
(64 counts)
(65 counts)
n=259, normal
(260 counts)
Figure E-1. PWM Outputs for Various Normal and Spread Modes
110
RabbitCore RCM3000
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参数描述
101-0524 功能描述:KIT DEV RABBIT RCM3000 INTL RoHS:否 类别:编程器，开发系统 >> 通用嵌入式开发板和套件（MCU、DSP、FPGA、CPLD等） 系列:RabbitCore 3000 产品培训模块:Blackfin® Processor Core Architecture Overview Blackfin® Device Drivers Blackfin® Optimizations for Performance and Power Consumption Blackfin® System Services 特色产品:Blackfin? BF50x Series Processors 标准包装:1 系列:Blackfin® 类型:DSP 适用于相关产品:ADSP-BF548 所含物品:板，软件，4x4 键盘，光学拨轮，QVGA 触摸屏 LCD 和 40G 硬盘 配用:ADZS-BFBLUET-EZEXT-ND - EZ-EXTENDER DAUGHTERBOARDADZS-BFLLCD-EZEXT-ND - BOARD EXT LANDSCAP LCD INTERFACE 相关产品:ADSP-BF542BBCZ-4A-ND - IC DSP 16BIT 400MHZ 400CSBGAADSP-BF544MBBCZ-5M-ND - IC DSP 16BIT 533MHZ MDDR 400CBGAADSP-BF542MBBCZ-5M-ND - IC DSP 16BIT 533MHZ MDDR 400CBGAADSP-BF542KBCZ-6A-ND - IC DSP 16BIT 600MHZ 400CSBGAADSP-BF547MBBCZ-5M-ND - IC DSP 16BIT 533MHZ MDDR 400CBGAADSP-BF548BBCZ-5A-ND - IC DSP 16BIT 533MHZ 400CSBGAADSP-BF547BBCZ-5A-ND - IC DSP 16BIT 533MHZ 400CSBGAADSP-BF544BBCZ-5A-ND - IC DSP 16BIT 533MHZ 400CSBGAADSP-BF542BBCZ-5A-ND - IC DSP 16BIT 533MHZ 400CSBGA
101-0525 功能描述:开发板和工具包 - 其他处理器 LP3500 RoHS:否 制造商:Freescale Semiconductor 产品:Development Systems 工具用于评估:P3041 核心:e500mc 接口类型:I2C, SPI, USB 工作电源电压:
101-0526 功能描述:开发板和工具包 - 其他处理器 LP3510 RoHS:否 制造商:Freescale Semiconductor 产品:Development Systems 工具用于评估:P3041 核心:e500mc 接口类型:I2C, SPI, USB 工作电源电压:
101-0529 功能描述:开发板和工具包 - 其他处理器 LP3500 Tool Kit RoHS:否 制造商:Freescale Semiconductor 产品:Development Systems 工具用于评估:P3041 核心:e500mc 接口类型:I2C, SPI, USB 工作电源电压:
101053 制造商:RUKO 功能描述:Bulk
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