Atmel SAM4S-EK2 Atmel ATSAM4S-EK2 ATSAM4S-EK2 Data Sheet

 875

SAM4S [DATASHEET]

11100E–ATARM–24-Jul-13



If the channel is a synchronous channel and update method 1 or 2 is selected (SYNCx=1 and UPDM=1 or 2 in 
PWM_SCM register):



registers PWM_CPRDUPDx and PWM_DTUPDx hold the new period and dead-times values until the bit 
UPDULOCK is written at “1” (in PWM_SCUC register) and the end of the current PWM period, then update 
the values for the next period. 



register PWM_CDTYUPDx holds the new duty-cycle value until the end of the update period of synchronous 
channels (when UPRCNT is equal to UPR in 

 

(PWM_SCUP)) and the end of the current PWM period, then updates the value for the next period.

Note:

If the update registers PWM_CDTYUPDx, PWM_CPRDUPDx and PWM_DTUPDx are written several times 
between two updates, only the last written value is taken into account.

PWM_CPRDUPDx Value

PWM_CPRDx

PWM_CDTYx

- If Asynchronous Channel

-> End of PWM period

- If Synchronous Channel

-> End of PWM period and UPDULOCK = 1

User s Writing

PWM_DTUPDx Value

User s Writing

PWM_DTx

- If Asynchronous Channel

-> End of PWM period

- If Synchronous Channel

- If UPDM = 0

-> End of PWM period and UPDULOCK = 1

- If UPDM = 1 or 2

-> End of PWM period and end of Update Period

PWM_CDTYUPDx Value

User s Writing