Atmel SAM9X25, Manual

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729
11054A–ATARM–27-Jul-11
SAM9X25
729
11054A–ATARM–27-Jul-11
SAM9X25
37.5 Product Dependencies
37.5.1 I/O Lines
The pins used for interfacing the PWM may be multiplexed with PIO lines. The programmer must
first program the PIO controller to assign the desired PWM pins to their peripheral function. If I/O
lines of the PWM are not used by the application, they can be used for other purposes by the
PIO controller.
All of the PWM outputs may or may not be enabled. If an application requires only four channels,
then only four PIO lines will be assigned to PWM outputs.
37.5.2 Power Management
The PWM is not continuously clocked. The programmer must first enable the PWM clock in the
Power Management Controller (PMC) before using the PWM. However, if the application does
not require PWM operations, the PWM clock can be stopped when not needed and be restarted
later. In this case, the PWM will resume its operations where it left off.
Configuring the PWM does not require the PWM clock to be enabled.
37.5.3 Interrupt Sources
The PWM interrupt line is connected on one of the internal sources of the Interrupt Controller.
Using the PWM interrupt requires the Interrupt Controller to be programmed first. Note that it is
not recommended to use the PWM interrupt line in edge sensitive mode.
Table 37-2. I/O Lines
Instance Signal I/O Line Peripheral
PWM PWM0 PB11 B
PWM PWM0 PC10 C
PWM PWM0 PC18 C
PWM PWM1 PB12 B
PWM PWM1 PC11 C
PWM PWM1 PC19 C
PWM PWM2 PB13 B
PWM PWM2 PC20 C
PWM PWM3 PB14 B
PWM PWM3 PC21 C
Table 37-3. Peripheral IDs
Instance ID
PWM 18