AT91SAM7S256D-AU Atmel, AT91SAM7S256D-AU Datasheet - Page 505

• 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

35.5
35.5.1
Figure 35-3. Example of USB V2.0 Full-speed Communication Control
The Control Transfer endpoint EP0 is always used when a USB device is first configured (USB v. 2.0 specifications).
35.5.1.1
Table 35-2.
35.5.1.2
Transfer
Control
Isochronous
Interrupt
Bulk
Functional Description
The USB V2.0 full-speed provides communication services between host and attached USB devices. Each device
is offered with a collection of communication flows (pipes) associated with each endpoint. Software on the host
communicates with a USB device through a set of communication flows.
A communication flow is carried over one of four transfer types defined by the USB device.
Each transfer results in one or more transactions over the USB bus. There are three kinds of transactions flowing
across the bus in packets:
1. Setup Transaction
2. Data IN Transaction
3. Data OUT Transaction
USB V2.0 Full-speed Introduction
USB V2.0 Full-speed Transfer Types
USB Bus Transactions
USB Communication Flow
Unidirectional
Unidirectional
Unidirectional
Bidirectional
Direction
Software Client
USB Host V2.0
Not guaranteed
Not guaranteed
Not guaranteed
Guaranteed
Bandwidth
Data Flow: Control Transfer
Data Flow: Isochronous or Bulk In Transfer
Data Flow: Isochronous or Bulk Out Transfer
Supported Endpoint Size
8, 16, 32, 64
8, 16, 32, 64
USB Device endpoint configuration requires that
in the first instance Control Transfer must be EP0.
≤ 64
64
SAM7S Series [DATASHEET]
EP0
EP1
EP2
Error Detection
USB Device 2.0
Yes
Yes
Yes
Yes
6175M–ATARM–26-Oct-12
Automatic
Retrying
Yes
Yes
No
505