AN2518 Freescale Semiconductor / Motorola, AN2518 Datasheet - Page 11

• Manufacturer Part Number: AN2518
• Description: 3-Phase Sine Wave Generator - 3 outputs version - XOR version TPU Function Set
• Manufacturer: Freescale Semiconductor / Motorola

Performance
MOTOROLA
3-Phase Sine Wave Generator – 3 outputs version – XOR version TPU Function Set (3Sin3Xor)
NOTE:
The maximum PWM frequency is 45kHz (PWM period T = 444). This can be
achieved when only 3Sin3Xor_R and 3Sin3Xor_T run on the TPU and the IMB
clock is 40MHz. When other functions run on the same TPU, the minimum
PWM period T has to be greater. Get all the other running function states that
can be served during one PWM period. Get their lengths (number of IMB clock
cycles) and add a time slot transition of 10 IMB clock cycles to each one. Sum
all the states lengths including the time slot transition. Convert the result from
IMB clock cycles to TCR1 clock cycles according to TCR1 prescaler settings.
The result indicates how much greater than the minimum value of 444, T has
to be for that particular case.
Execution times do not include the time slot transition time (TST = 10 or 14 IMB
clocks)
Freescale Semiconductor, Inc.
For More Information On This Product,
STOP
State
State
SFR
SFC
SFC
SFC
SFC
SFC
SFC
SFC
SFR
INIT
ST
SF
C7
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0
0
1
2
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Table 9. 3Sin3Xor_R State Statistics
Table 8. 3Sin3Xor_T State Statistics
Max IMB Clock Cycles
Max IMB Clock Cycles
102
82
66
16
58
96
88
68
68
80
2
2
6
6
RAM Accesses by TPU
RAM Accesses by TPU
Detailed Function Description
24
23
10
1
0
4
1
4
1
7
7
8
8
9
AN2518/D
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