20-101-1217 Rabbit Semiconductor, 20-101-1217 Datasheet - Page 128
![MODULE RABBITCORE RCM3229](/photos/6/74/67475/20-101-1217_sml.jpg)
20-101-1217
Manufacturer Part Number
20-101-1217
Description
MODULE RABBITCORE RCM3229
Manufacturer
Rabbit Semiconductor
Specifications of 20-101-1217
Module/board Type
MPU Core Module
For Use With/related Products
RCM3229
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
316-1146
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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.
122
n=255, normal
n=259, normal
n=255, spread
n=258, spread
n=256, spread
n=257, spread
n=259, spread
00
01
10
11
Pulse Width LSBs
Figure E-1. PWM Outputs for Various Normal and Spread Modes
(64 counts)
(65 counts)
(65 counts)
(65 counts)
(65 counts)
n/4 + 1
n/4 + 1
n/4 + 1
n/4 + 1
Table E-3. PWM Outputs
1st
(260 counts)
(256 counts)
(64 counts)
(64 counts)
(64 counts
(65 counts)
(65 counts)
n/4
n/4
n/4 + 1
n/4 + 1
)
2nd
(64 counts)
(64 counts
(65 counts)
(65 counts)
(65 counts)
n/4
n/4 + 1
n/4 + 1
n/4 + 1
3rd
)
RabbitCore RCM3200
(64 counts)
(64 counts)
(64 counts)
(64 counts)
n/4
n/4
n/4
n/4 + 1
(65 counts)
4th
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