Техническая Спецификация для Atmel SAM4S Xplained Pro Starter and Evaluation Kit ATSAM4S-XPRO ATSAM4S-XPRO
Модели
ATSAM4S-XPRO
SAM4S Series [DATASHEET]
Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14
950
If the channel is an asynchronous channel (SYNCx = 0 in
(PWM_SCM)), these registers hold the new period, duty-cycle and dead-times values until the end of the
current PWM period and update the values for the next period.
If the channel is a synchronous channel and update method 0 is selected (SYNCx = 1 and UPDM = 0 in
PWM_SCM register), these registers hold the new period, duty-cycle and dead-times values until the bit
UPDULOCK is written at ‘1’ (in
(PWM_SCUC)) and the end
of the current PWM period, then update the values for the next period.
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) 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.
Figure 39-17. Synchronized Period, Duty-Cycle and Dead-Times Update
39.6.5.4 Changing the Synchronous Channels Update Period
It is possible to change the update period of synchronous channels while they are enabled. (See “Method 2:
Manual write of duty-cycle values and automatic trigger of the update” on page 943 and “Method 3: Automatic
PWM_CPRDUPDx Value
PWM_CPRDx
PWM_CDTYx
- If Asynchronous Channel
-> End of PWM period
- If Synchronous Channel
-> End of PWM period and UPDULOCK = 1
-> 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
-> 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