AT91SAM7S321-AU Atmel, AT91SAM7S321-AU Datasheet - Page 456

• Manufacturer Part Number: AT91SAM7S321-AU
• Description: IC ARM7 MCU FLASH 32K 64LQFP
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91SAM7S321-AU

• Core Processor: ARM7
• Core Size: 16/32-Bit
• Speed: 55MHz
• Connectivity: I²C, SPI, SSC, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, DMA, POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 1.95 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-LQFP
• Processor Series: AT91SAMx
• Core: ARM7TDMI
• Data Bus Width: 32 bit
• Data Ram Size: 8 KB
• Interface Type: I2C, I2S, SPI, SSC, TWI, UART, USB
• Maximum Clock Frequency: 55 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 10 bit
• Operating Supply Voltage: 1.8 V to 3.3 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: JTRACE-ARM-2M, KSK-AT91SAM7S-PL, MDK-ARM, RL-ARM, ULINK2
• Development Tools By Supplier: AT91SAM-ICE, AT91-ISP, AT91SAM7S-EK
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 8 Channel
• Controller Family/series: AT91SAM7xxxx
• No. Of I/o's: 32
• Ram Memory Size: 8KB
• Cpu Speed: 55MHz
• No. Of Timers: 3
• Rohs Compliant: Yes
• For Use With: AT91SAM-ICE - EMULATOR FOR AT91 ARM7/ARM9AT91SAM7S-EK - KIT EVAL FOR ARM AT91SAM7S
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Figure 34-11. Data OUT Transfer for Ping-pong Endpoint
Note:
34.5.2.8
456
USB Bus
Packets
RX_DATA_BK0 Flag
(UDP_CSRx)
RX_DATA_BK1 Flag
(UDP_CSRx)
FIFO (DPR)
Bank 0
FIFO (DPR)
Bank 1
An interrupt is pending while the RX_DATA_BK0 or RX_DATA_BK1 flag is set.
AT91SAM7S Series Preliminary
Stall Handshake
Host Sends First Data Payload
Data OUT
PID
Set by USB Device,
Data Payload Written
in FIFO Endpoint Bank 0
Write by USB Device
Data OUT1
Warning: When RX_DATA_BK0 and RX_DATA_BK1 are both set, there is no way to determine
which one to clear first. Thus the software must keep an internal counter to be sure to clear alter-
natively RX_DATA_BK0 then RX_DATA_BK1. This situation may occur when the software
application is busy elsewhere and the two banks are filled by the USB host. Once the application
comes back to the USB driver, the two flags are set.
A stall handshake can be used in one of two distinct occasions. (For more information on the
stall handshake, refer to Chapter 8 of the Universal Serial Bus Specification, Rev 2.0.)
The following procedure generates a stall packet:
10. The microcontroller transfers out data received from the endpoint’s memory to the
11. The microcontroller notifies the USB device it has finished the transfer by clearing
12. A fourth Data OUT packet can be accepted by the USB device and copied in the FIFO
• A functional stall is used when the halt feature associated with the endpoint is set. (Refer to
• To abort the current request, a protocol stall is used, but uniquely with control transfer.
Chapter 9 of the Universal Serial Bus Specification, Rev 2.0, for more information on the halt
feature.)
microcontroller’s memory. Data received is available by reading the endpoint’s UDP_
FDRx register.
RX_DATA_BK1 in the endpoint’s UDP_ CSRx register.
Bank 0.
Data OUT 1
ACK
PID
Read By Microcontroller
Set by USB Device,
Data Payload Written
in FIFO Endpoint Bank 1
Interrupt Pending
Microcontroller Reads Data 1 in Bank 0,
Host Sends Second Data Payload
Data OUT 1
Data OUT
PID
Write by USB Device
Data OUT 2
Data OUT 2
Cleared by Firmware
ACK
PID
Read By Microcontroller
Data OUT
Microcontroller Reads Data2 in Bank 1,
Host Sends Third Data Payload
PID
Interrupt Pending
Data OUT 2
Write In Progress
Cleared by Firmware
6175G–ATARM–22-Nov-06
Data OUT 3
Data OUT 3
A
P