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| 型號： | MC68HC708MP16 |
| 廠商： | Motorola, Inc. |
| 英文描述： | 8-Bit Microcontroller Units (MCU).(8位微控制器) |
| 中文描述： | 8位微控制器單元（MCU）。（8位微控制器） |
| 文件頁數(shù)： | 11/44頁 |
| 文件大小： | 342K |
| 代理商： | MC68HC708MP16 |
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Application Note
High or Low PWM Outputs: Whatever Turns You On
AN1712
MOTOROLA
11
High or Low PWM Outputs: Whatever Turns You On
By the time the PWM signal makes its journey through the optos and
gate drivers, it may arrive at the power device with the wrong polarity.
This can really be annoying, especially if extra hardware is required just
to invert the PWM signals.
With the 'MP16, the polarity can be specified for the odd numbered PWM
signals independently from the even PWMs. It is assumed that the odd
numbered PWMs will be used to control the top transistors in a drive, and
the even numbered PWM signals will control the bottom transistors. The
bits TOPNEG and BOTNEG in the CONFIG register allow the software
to invert the top and bottom PWM polarities respectively. This is also
useful when interfacing a new microcontroller board to an existing power
stage with established PWM polarity requirements.
When the 'MP16 is first powered up or reset, the PWMEN bit in the
PCTL1 register is 0, and the PWM pins assume a high-impedance state.
If an opto is driven directly from a PWM output, a polarity convention,
therefore, should be established where no LED current corresponds to
the "off" condition. During this high-impedance time, the software must
program the correct polarity information into the CONFIG register before
enabling the PWMs by setting the PWMEN bit. Once this bit is set, all
PWM outputs will exit the high-impedance state and be negated for one
CPU clock cycle before being driven in accordance with the values
programmed in the PWM module. From that point on, if the processor
shuts down the PWMs for any reason, they will be quickly driven to the
"off" voltage level instead of floating, since the processor now knows
which voltage level is "off."
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相關(guān)代理商/技術(shù)參數(shù) |
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