ters. Each PWM " />
參數(shù)資料
型號： 20-101-0542
廠商： Rabbit Semiconductor
文件頁數(shù)： 33/138頁
文件大小： 0K
描述： CABLE 1.27MM FOR RCM3200
標準包裝： 1
附件類型： 編程纜線
適用于相關(guān)產(chǎn)品： 基于 Rabbit 3000 的產(chǎn)品，不包括 RCM30/3100、LP3500
產(chǎn)品目錄頁面： 620 (CN2011-ZH PDF)
其它名稱： 20-101-0542-ND
316-1180
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)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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20-101-0546 功能描述:單板計算機 BL2130 Btm Mnt RoHS:否 制造商:Ampro By ADLINK 外觀尺寸:EPIC 處理器類型:Intel Atom D510 頻率:1.66 GHz 存儲容量:2 GB (max) 存儲類型:DDR2, L2 Cache 接口類型:Ethernet, PS/2, SATA, Serial, USB 工作電源電壓:5 V, 12 V 功耗:13 W 最大工作溫度:+ 70 C 尺寸:165.1 mm x 114.3 mm
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