AT91SAM7S256D-AU Atmel, AT91SAM7S256D-AU Datasheet - Page 481

• Manufacturer Part Number: AT91SAM7S256D-AU
• Description: ARM Microcontrollers - MCU 256K Flash SRAM 64K ARM based MCU
• Manufacturer: Atmel
• Series: SAM7S256r

Specifications of AT91SAM7S256D-AU

• Rohs: yes
• Core: ARM
• Processor Series: AT91SAM
• Data Bus Width: 16 bit/32 bit
• Maximum Clock Frequency: 55 MHz
• Program Memory Size: 256 KB
• Data Ram Size: 64 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 3 V to 3.6 V
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: LQFP-64
• Mounting Style: SMD/SMT
• Interface Type: 2-Wire, I2S, SPI, USART
• Length: 7 mm

34. Pulse Width Modulation Controller (PWM)
34.1
34.2
overview
The PWM macrocell controls several channels independently. Each channel controls one square output waveform.
Characteristics of the output waveform such as period, duty-cycle and polarity are configurable through the user
interface. Each channel selects and uses one of the clocks provided by the clock generator. The clock generator
provides several clocks resulting from the division of the PWM macrocell master clock.
All PWM macrocell accesses are made through APB mapped registers.
Channels can be synchronized, to generate non overlapped waveforms. All channels integrate a double buffering
system in order to prevent an unexpected output waveform while modifying the period or the duty-cycle.
Block Diagram
Figure 34-1. Pulse Width Modulation Controller Block Diagram
PMC
MCK
Clock Generator
Channel
Selector
Channel
Selector
PWMx
PWM0
Clock
Clock
APB Interface
Controller
PWM
Duty Cycle
Duty Cycle
Counter
Counter
Update
Update
Period
Period
APB
Comparator
Comparator
Interrupt Generator
SAM7S Series [DATASHEET]
PIO
6175M–ATARM–26-Oct-12
AIC
PWMx
PWMx
PWM0
PWM0
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