mc9s12xs128 Freescale Semiconductor, Inc, mc9s12xs128 Datasheet - Page 365
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mc9s12xs128
Manufacturer Part Number
mc9s12xs128
Description
Hcs12 Microcontrollers 16-bit Automotive Microcontroller
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC9S12XS128.pdf
(738 pages)
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Chapter 13
Pulse-Width Modulator (S12PWM8B8CV1)
13.1
The PWM definition is based on the HC12 PWM definitions. It contains the basic features from the HC11
with some of the enhancements incorporated on the HC12: center aligned output mode and four available
clock sources.The PWM module has eight channels with independent control of left and center aligned
outputs on each channel.
Each of the eight channels has a programmable period and duty cycle as well as a dedicated counter. A
flexible clock select scheme allows a total of four different clock sources to be used with the counters. Each
of the modulators can create independent continuous waveforms with software-selectable duty rates from
0% to 100%. The PWM outputs can be programmed as left aligned outputs or center aligned outputs.
13.1.1
The PWM block includes these distinctive features:
Freescale Semiconductor
Number
Version
01.17
•
•
•
•
•
•
•
•
•
•
Eight independent PWM channels with programmable period and duty cycle
Dedicated counter for each PWM channel
Programmable PWM enable/disable for each channel
Software selection of PWM duty pulse polarity for each channel
Period and duty cycle are double buffered. Change takes effect when the end of the effective period
is reached (PWM counter reaches zero) or when the channel is disabled.
Programmable center or left aligned outputs on individual channels
Eight 8-bit channel or four 16-bit channel PWM resolution
Four clock sources (A, B, SA, and SB) provide for a wide range of frequencies
Programmable clock select logic
Emergency shutdown
Introduction
Revision
Features
Date
08-01-2004
Effective
Date
S12XS Family Reference Manual, Rev. 1.10
Author
Added clarification of PWMIF operation in STOP and WAIT mode.
Added notes on minimum pulse width of emergency shutdown
signal.
Description of Changes
365
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