AN2519 Freescale Semiconductor / Motorola, AN2519 Datasheet - Page 18

• Manufacturer Part Number: AN2519
• Description: 3Sin with Dead-Time Correction - XOR version TPU Function Set
• Manufacturer: Freescale Semiconductor / Motorola

AN2519/D
Synchronized Change
of PWM Prescaler
And Synchronization
Signal Prescaler
Host Interface
18
3Sin with Dead-Time Correction – XOR version TPU Function Set (3SinDtXor)
The 3SinDtXor_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 3SinDtXor_R 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.
move > 0
move > 0
prescaler = 1
prescaler = 1
move < 0
move < 0
prescaler = 2
prescaler = 2
3
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2
For More Information On This Product,
|move|
|move|
Written By CPU
Written By TPU
1
1
1
Figure 7. Synchronization signal adjustment examples
center_time
center_time
center_time
center_time
0
0
0
T
T
T
T
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pw
pw
Channel Function Select
Channel Priority
Host Service Bits (HSR)
|move|
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Name
Table 10. 3SinDtXor_sync Control Bits
pw
pw
center_time
center_time
center_time
center_time
center_time
center_time
T
T
T
T
T
T
3SinDtXor_sync function number
00 – Channel Disabled
01 – Low Priority
10 – Middle Priority
11 – High Priority
00 – No Host Service Request
01 – Not used
10 – Initialization
11 – Not used
(Assigned during assembly the
DPTRAM code from library TPU
functions)
Written by both CPU and TPU
Not Used
Options
center_time
center_time
T
T
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