mc68hc708mp16 Freescale Semiconductor, Inc, mc68hc708mp16 Datasheet - Page 150

• Manufacturer Part Number: mc68hc708mp16
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Pulse Width Modulator for Motor Control (PWMMC)
Technical Data
150
During deadtime, load inductance distorts output voltage by keeping
inductive current flowing through the diodes. Inductive distortion either
lengthens or shortens the pulse width by one deadtime interval,
depending on current direction. This deadtime distortion then either
increases or decreases the averaged sinusoidal output voltage.
In complementary channel operation, either the odd-numbered or the
even-numbered PWMVAL registers control the pulse width at any given
time. For a given PWM pair, whether the odd or even PWMVAL registers
are active depends on either:
Pulse Width Modulator for Motor Control (PWMMC)
•
•
The state of the current-sensing pin, ISx, for that driver, or
The state of the output polarity bit, IPOLx, for that driver
Figure 9-19. Sinusoidal Distortion of Load Voltage
DESIRED
VOLTAGE
POSITIVE
CURRENT
NEGATIVE
CURRENT
MC68HC708MP16
Freescale Semiconductor
—
Rev. 3.1