
Pulse-Width Modulation (PWM) Module
26-10
Freescale Semiconductor
26.2.10 PWM Channel Period Registers (PWMPERn)
The PWM period registers determine the period of the associated PWM channel. Refer to
for more information.
Calculating the output period depends on the output mode (center-aligned has twice the period as
left-aligned mode) as well as PWMPER
n
. See the below equation:
Eqn. 26-3
For boundary case programming values (e.g. PWMPER
n
= 0x00), please refer to
.
26.2.11 PWM Channel Duty Registers (PWMDTYn)
The PWM duty registers determine the duty cycle of the associated PWM channel. To calculate the output
duty cycle (high time as a percentage of period) for a particular channel:
Eqn. 26-4
Table 26-10. PWMCNTn Field Descriptions
Field
Description
7–0
COUNT
Current value of the PWM up counter. Resets to zero when written.
Address: 0xFC09_0034 (PWMPER0)
0xFC09_0035 (PWMPER1)
0xFC09_0036 (PWMPER2)
0xFC09_0037 (PWMPER3)
0xFC09_0038 (PWMPER4)
0xFC09_0039 (PWMPER5)
0xFC09_003A (PWMPER6)
0xFC09_003B (PWMPER7)
Access: User Read/Write
7
6
5
4
3
2
1
0
R
PERIOD
W
Reset:
1
1
1
1
1
1
1
1
Figure 26-11. PWM Period Registers (PWMPERn)
Table 26-11. PWMPERn Field Descriptions
Field
Description
7–0
PERIOD
Period counter for the output PWM signal.
If PERIOD equals 0x00, the PWMn output is always high (PPOLn=1) or always low (PPOLn=0). See
Section 26.3.2.8, “PWM Boundary Cases”
for other special cases.
PWM
n
period
Channel clock period
PWMCAE CAE
n
[
]
1
+
(
)
PWMPER
n
×
×
=
Duty Cycle
1
PWMPOL PPOL
n
[
]
PWMDTY
n
PWMPER
n
------------------------------
–
–
⎝
⎠
⎛
⎞
100%
×
=
MCF5329 Reference Manual, Rev 3
Содержание MCF5329
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