AN2533/D

14

Standard SVM – 3 outputs version – XOR version TPU Function Set (svmStd3Xor)

MOTOROLA

Figure 6. Synchronization signal adjustment examples

Synchronized Change

of PWM Prescaler

And Synchronization

Signal Prescaler

The svmStd3Xor_sync TPU function actually uses the presc_copy parameter

instead of the prescaler parameter. The prescaler parameter holds the

prescaler value that is copied to the presc_copy by the svmStd3Xor_bottom

function at the time the PWM parameters are reloaded. This ensures that new

prescaler values for the PWM signals, as well as the synchronization signal, are

applied at the same time. Write the synchronization signal prescaler parameter

address to the sync_presc_addr parameter to enable this mechanism. Write 0

to disable it, and remember to set the synchronization signal presc_copy

parameter instead of the prescaler parameter in this case.

Host Interface

center_time

T

center_time

T

center_time

T

pw

|move|

move < 0

prescaler = 2

center_time

T

center_time

T

center_time

T

pw

|move|

move > 0

prescaler = 1

center_time

T

center_time

T

center_time

T

pw

|move|

move < 0

prescaler = 2

center_time

T

center_time

T

center_time

T

pw

|move|

move > 0

prescaler = 1

Table 10. svmStd3Xor_sync Control Bits

Name

Options

Channel Function Select

svmStd3Xor_sync function number

(Assigned during assembly the

DPTRAM code from library TPU

functions)

Channel Priority

00 – Channel Disabled

01 – Low Priority

10 – Middle Priority

11 – High Priority

Written By CPU

Written By TPU

Written by both CPU and TPU

Not Used

32

1

0

1

0

Freescale Semiconductor, Inc.

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