AT91SAM7S256D-AU Atmel, AT91SAM7S256D-AU Datasheet - Page 17

• 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

7.4
Peripheral DMA Controller
Handles data transfer between peripherals and memories
Eleven channels: SAM7S512/256/128/64/321/161
Nine channels: SAM7S32/16
Low bus arbitration overhead
Next Pointer management for reducing interrupt latency requirements
Peripheral DMA Controller (PDC) priority is as follows (from the highest priority to the lowest):
Two for each USART
Two for the Debug Unit
Two for the Serial Synchronous Controller
Two for the Serial Peripheral Interface
One for the Analog-to-digital Converter
One Master Clock cycle needed for a transfer from memory to peripheral
Two Master Clock cycles needed for a transfer from peripheral to memory
Receive
Receive
Receive
Receive
Receive
Receive
Transmit
Transmit
Transmit
Transmit
Transmit
DBGU
USART0
USART1
SSC
ADC
SPI
DBGU
USART0
USART1
SSC
SPI
SAM7S Series [DATASHEET]
6175M–ATARM–26-Oct-12
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