AN2515 Freescale Semiconductor / Motorola, AN2515 Datasheet - Page 10

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

AN2515/D
Performance
10
Phase A
Phase B
Phase C
flag0 = 1
HL_RLD
NOTE:
3-Phase Sine Wave Generator – 3 outputs version TPU Function Set (3Sin3)
C2 C3 C4 C5 C6
not a reload period
HL
The maximum PWM frequency is 35.4 kHz (PWM period T = 565 at 20MHz
TCR1 clock). This can be achieved when only 3Sin3 runs 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 enabled 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 state lengths, including the time slot transition. Convert the result from
IMB clock cycles to TCR1 clock cycles according to TCR1 prescaler settings.
The result then indicates how much greater than its minimum value of 565, T
has to be for the particular case.
Execution times do not include the time slot transition time (TST = 10 or 14 IMB
clocks)
center_time
Freescale Semiconductor, Inc.
HL
T
For More Information On This Product,
LH_C7
HL_RLD
LH_C7
STOP
State
INIT
LH_C7
HL
C1
C2
C3
C4
C5
C6
Go to: www.freescale.com
Figure 3. 3Sin3 timing
Table 7. 3Sin3 State Statistics
LH_C7
Max IMB Clock Cycles
HL_RLD
72
20
26
58
46
84
82
66
66
66
2
C1 C2 C3
HL
C4
reload period
C5 C6
center_time
HL
RAM Accesses by TPU
T
LH_C7
LH_C7
21
22
10
0
1
7
4
6
7
7
6
MOTOROLA
LH_C7