AN2525 Freescale Semiconductor / Motorola, AN2525 Datasheet - Page 17

• Manufacturer Part Number: AN2525
• Description: DC Motor - XOR version TPU Function Set
• Manufacturer: Freescale Semiconductor / Motorola

Resolver Reference
Signal for DC Motor
– XOR version
(DCmXor_res)
Synchronized Change
of PWM Prescaler
And Resolver
Reference Signals
Prescaler
MOTOROLA
The DCmXor_res TPU function uses information read from the DCmXor_C and
DCmXor_T 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 before or after the PWM period center time of a number of TCR1
TPU cycles.
The DCmXor_res TPU function can inherit the Synchronization Signal
prescaler that is synchronously changed with 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
prescaler parameter to directly specify prescaler value.
move > 0
prescaler = 1
move < 0
prescaler = 2
DC Motor – XOR version TPU Function Set (DCmXor)
Freescale Semiconductor, Inc.
For More Information On This Product,
|move|
Figure 9. Resolver reference signal adjustment examples
center_time
center_time
T
T
Go to: www.freescale.com
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center_time
center_time
center_time
T
T
T
Detailed Function Description
center_time
T
AN2525/D
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