ters. Each PWM " />
參數(shù)資料
型號(hào)： 20-101-1217
廠商： Rabbit Semiconductor
文件頁數(shù)： 33/138頁
文件大?。?/td> 0K
描述： MODULE RABBITCORE RCM3229
標(biāo)準(zhǔn)包裝： 50
系列： RabbitCore®
模塊/板類型： MPU 核心模塊
適用于相關(guān)產(chǎn)品： RCM3229
產(chǎn)品目錄頁面： 620 (CN2011-ZH PDF)
其它名稱： 316-1146
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(guān)PDF資料
PDF描述
20-101-0494 MODULE RABBITCORE RCM2250
AT25020N-10SI-2.7 IC EEPROM 2KBIT 2.1MHZ 8SOIC
345-030-521-801 CARDEDGE 30POS DUAL .100 GREEN
12FMN-BMTTN-A-TF CONN FMN HSNG 12POS STAG NOR SMD
AT25020-10PI-2.7 IC EEPROM 2KBIT 2.1MHZ 8DIP
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