at91sam9263 ATMEL Corporation, at91sam9263 Datasheet - Page 721

• Manufacturer Part Number: at91sam9263
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

Figure 38-6. Synchronized Period or Duty Cycle Update
Figure 38-7. Polling Method
Note:
6249D–ATARM–20-Dec-07
Polarity and alignment can be modified only when the channel is disabled.
To prevent overwriting the PWM_CUPDx by software, the user can use status events in order to
synchronize his software. Two methods are possible. In both, the user must enable the dedi-
cated interrupt in PWM_IER at PWM Controller level.
The first method (polling method) consists of reading the relevant status bit in PWM_ISR Regis-
ter according to the enabled channel(s). See
The second method uses an Interrupt Service Routine associated with the PWM channel.
Note:
End of Cycle
Reading the PWM_ISR register automatically clears CHIDx flags.
Acknowledgement and clear previous register state
The last write has been taken into account
PWM_CPRDx
Update of the Period or Duty Cycle
Writing in PWM_CUPDx
PWM_CUPDx Value
Writing in CPD field
PWM_ISR Read
1
User's Writing
CHIDx = 1
YES
PWM_CDTYx
0
AT91SAM9263 Preliminary
Figure
38-7.
PWM_CMRx. CPD
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