參數(shù)資料
型號(hào)： 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(yè)數(shù)： 32/44頁(yè)
文件大?。?/td> 342K
代理商： MC68HC708MP16
Application Note
AN1712
32
MOTOROLA
Recall that center-aligned PWM mode yields half the resolution for a
given PWM frequency compared to edge-aligned mode. However, by
judicious calculation of the two PWM values, this reduction in resolution
can be recouped for this application. Consider the "motor" waveform of
Figure 18
. Each consecutive positive pulse has the same duty cycle
since the PWM 1 and PWM 3 value registers are programmed to
produce identical pulse widths.
What would happen if this were not the case For example, suppose one
count is subtracted from the PWM 3 value register to produce a slightly
longer positive pulse width than that of the PWM 1 value register. The
effective high time over a PWM cycle (as defined by a complete up/down
cycle of the PWM counter) would be the average of these two widths. In
other words, the average pulse width would be in between that specified
by the PWM 1 and PWM 3 value registers, yielding a 1/2 count
resolution.
Figure 18. Center-Aligned PWM Effect on Motor
PWM1
PWM2
PWM3
PWM4
MOTOR
GND
– V
Bus
PWMFREQUENCY AT MOTOR IS DOUBLED VOLTAGE SWING IS HALVED
MOTOR RIPPLE CURRENT IS REDUCED
PWM1 VALUE REGISTER
PWM3 VALUE REGISTER
50%
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC68HC708MP16CFU 制造商:MAJOR 功能描述:
MC68HC711D3CFBE2 制造商:Freescale Semiconductor 功能描述:
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