AT91SAM7X512-AU-999 Atmel, AT91SAM7X512-AU-999 Datasheet - Page 431

• Manufacturer Part Number: AT91SAM7X512-AU-999
• Description: IC MCU ARM 512K HS FLASH 100LQFP
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91SAM7X512-AU-999

• Core Processor: ARM7
• Core Size: 16/32-Bit
• Speed: 55MHz
• Connectivity: CAN, Ethernet, I²C, SPI, SSC, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, DMA, POR, PWM, WDT
• Number Of I /o: 62
• Program Memory Size: 512KB (512K x 8)
• Program Memory Type: FLASH
• Ram Size: 128K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 1.95 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

6120H–ATARM–17-Feb-09
Figure 33-6. Synchronized Period or Duty Cycle Update
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:
Figure 33-7. Polling Method
Note:
Reading the PWM_ISR register automatically clears CHIDx flags.
Polarity and alignment can be modified only when the channel is disabled.
End of Cycle
Acknowledgement and clear previous register state
AT91SAM7X512/256/128 Preliminary
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
Figure
YES
PWM_CDTYx
0
33-7.
PWM_CMRx. CPD
431