Datasheet

723
SAM9X25 [DATASHEET]
11054E–ATARM–10-Mar-2014
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.
All the PWM registers except PWM_CDTY and PWM_CPRD can be read without the PWM peripheral clock enabled. All
the registers can be written without the peripheral clock 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