XC912BC32CFU8 Motorola Semiconductor Products, XC912BC32CFU8 Datasheet - Page 147
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XC912BC32CFU8
Manufacturer Part Number
XC912BC32CFU8
Description
M68HC12B Family Data Sheet
Manufacturer
Motorola Semiconductor Products
Datasheet
1.XC912BC32CFU8.pdf
(362 pages)
- Current page: 147 of 362
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11.4.1 PWM Period Calculation
11.4.2 Equipment
M68HC12B Family — Rev. 8.0
MOTOROLA
These parameters were used to calculate the high-time values shown in
Table
For this exercise, use the M68HC912B32EVB emulation board.
•
•
•
•
•
11-3:
Period = $1000 (Hex) = 4096 (decimal)
E clock = 8 MHz
Prescaler = 4
Frequency = (8 MHz) / (#clocks_count*prescaler) = (8 MHz) (4096*4)
= 500 Hz
If period ($4096 Clocks) => frequency = 500 Hz
HEX Count
$0D9A
$0C00
$0020
$0040
$0080
$0100
$0200
$0040
$0080
$0996
$1000
Pulse-Width Modulator (PWM)
High-Time Values
Table 11-3. PWM Period Calculations
Figure 11-28. Example Waveform
PERIOD
Using the Output Compare 7 Feature to Generate a PWM
HIGH TIME
Decimal Count
1024
2048
2454
3072
3482
4096
128
256
512
32
64
HIGH TIME = DUTY CYCLE
Pulse-Width Modulator (PWM)
Duty Cycle
100.00%
12.50%
25.00%
50.00%
60.00%
75.00%
85.00%
6.25%
1.5%
3.1%
0%
Data Sheet
147
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