AT91SAM7S32-AI ATMEL [ATMEL Corporation], AT91SAM7S32-AI Datasheet - Page 370

• Manufacturer Part Number: AT91SAM7S32-AI
• Description: AT91 ARM Thumb-based Microcontrollers
• Manufacturer: ATMEL [ATMEL Corporation]

I/O Lines
Description
Product
Dependencies
I/O Lines
Power
Management
Interrupt Sources
370
AT91SAM7S32 Preliminary
Each channel outputs one waveform on one external I/O line.
Table 78. I/O Line Description
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 func-
tion. 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 chan-
nels, 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.
Configuring the PWM does not require the PWM clock to be enabled.
The PWM interrupt line is connected on one of the internal sources of the Advanced Interrupt
Controller. Using the PWM interrupt requires the AIC to be programmed first. Note that it is not
recommended to use the PWM interrupt line in edge sensitive mode.
Name
PWMx
Description
PWM Waveform Output for channel x
6071A–ATARM–28-Oct-04
Type
Output