AN2515 Freescale Semiconductor / Motorola, AN2515 Datasheet - Page 17

• Manufacturer Part Number: AN2515
• Description: 3-Phase Sine Wave Generator - 3 outputs version TPU Function Set
• Manufacturer: Freescale Semiconductor / Motorola

Resolver Reference
Signal for 3-Phase
Sine Wave
Generator – 3
outputs version
(3Sin3_res)
Synchronized Change
of PWM Prescaler
And Resolver
Reference Signals
Prescaler
MOTOROLA
3-Phase Sine Wave Generator – 3 outputs version TPU Function Set (3Sin3)
The 3Sin3_res TPU function uses information read from the 3Sin3 PWM
functions, the actual PWM center times and the PWM periods. This allows a
signal to be generated, which tracks the changes of the PWM period and is
always synchronized with the PWM. The resolver reference signal is a 50%
duty-cycle signal with a period equal to prescaler or synchronization channel
presc_copy PWM periods (see next paragraph). The low to high transition of
the pulse can be adjusted by a parameter, either negative or positive, to go a
number of TCR1 TPU cycles before or after the PWM period center time.
The 3Sin3_res TPU function can inherit the Synchronization Signal prescaler
that is synchronously changed with the PWM prescaler. Write the
synchronization signals presc_copy parameter address to the presc_addr
parameter to enable this mechanism. Write 0 to disable it, and in this case set
the prescaler parameter to directly specify prescaler value.
move > 0
prescaler = 1
move < 0
prescaler = 2
Freescale Semiconductor, Inc.
For More Information On This Product,
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Figure 10. Resolver reference signal adjustment examples
center_time
center_time
T
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Go to: www.freescale.com
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center_time
center_time
center_time
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Detailed Function Description
center_time
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