Atmel Evaluation Kit AT91SAM9X25-EK AT91SAM9X25-EK Data Sheet

723

SAM9X25 [DATASHEET]

11054E–ATARM–10-Mar-2014

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.

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.

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.

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

PWM

18