AT91SAM7S256D-AU Atmel, AT91SAM7S256D-AU Datasheet - Page 501

• 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. USB Device Port (UDP)
35.1
Table 35-1.
35.2
Figure 35-1. Block Diagram
MCK
UDPCK
udp_int
external_resume
Endpoint Number
0
1
2
3
Overview
The USB Device Port (UDP) is compliant with the Universal Serial Bus (USB) V2.0 full-speed device specification.
Each endpoint can be configured in one of several USB transfer types. It can be associated with one or two banks
of a dual-port RAM used to store the current data payload. If two banks are used, one DPR bank is read or written
by the processor, while the other is read or written by the USB device peripheral. This feature is mandatory for iso-
chronous endpoints. Thus the device maintains the maximum bandwidth (1M bytes/s) by working with endpoints
with two banks of DPR.
Suspend and resume are automatically detected by the USB device, which notifies the processor by raising an
interrupt. Depending on the product, an external signal can be used to send a wake up to the USB host controller.
Block Diagram
Access to the UDP is via the APB bus interface. Read and write to the data FIFO are done by reading and writing
8-bit values to APB registers.
Atmel Bridge
MCU
APB
Bus
to
USB Endpoint Description
Mnemonic
EP0
EP1
EP2
EP3
U
e
n
e
a
e
s
r
r
c
I
t
f
Dual-Bank
W
a
p
p
e
Master Clock
Domain
r
r
USB Device
Yes
Yes
No
No
FIFO
RAM
Dual
Port
Recovered 12 MHz
Domain
Max. Endpoint Size
W
a
p
p
e
r
r
Suspend/Resume Logic
12 MHz
64
64
64
8
Interface
Engine
Serial
SIE
SAM7S Series [DATASHEET]
Control/Bulk/Interrupt
Control/Bulk/Interrupt
6175M–ATARM–26-Oct-12
Bulk/Iso/Interrupt
Bulk/Iso/Interrupt
Endpoint Type
txoen
eopn
txd
rxdm
rxd
rxdp
Transceiver
Embedded
USB
DM
DP
501