AT91RM9200-QI-002 Atmel, AT91RM9200-QI-002 Datasheet - Page 568

• Manufacturer Part Number: AT91RM9200-QI-002
• Description: IC ARM9 MCU 208 PQFP
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91RM9200-QI-002

• Core Processor: ARM9
• Core Size: 16/32-Bit
• Speed: 180MHz
• Connectivity: EBI/EMI, Ethernet, I²C, MMC, SPI, SSC, UART/USART, USB
• Peripherals: POR
• Number Of I /o: 122
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: ROM
• Ram Size: 48K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 1.95 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 208-MQFP, 208-PQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

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AT91RM9200
The following procedure generates a stall packet:
When a setup transaction is received after a stall handshake, STALLSENT must be cleared in
order to prevent interrupts due to STALLSENT being set.
Figure 34-14. Stall Handshake (Data IN Transfer)
Figure 34-15. Stall Handshake (Data OUT Transfer)
• 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.
1. The microcontroller sets the FORCESTALL flag in the UDP_CSRx endpoint’s register.
2. The host receives the stall packet.
3. The microcontroller is notified that the device has sent the stall by polling the
Chapter 9 of the Universal Serial Bus Specification, Rev 1.1, for more information on the halt
feature.)
USB Bus
Packets
STALLSENT
FORCESTALL
USB Bus
Packets
FORCESTALL
STALLSENT
STALLSENT to be set. An endpoint interrupt is pending while STALLSENT is set. The
microcontroller must clear STALLSENT to clear the interrupt.
Data OUT PID
Data IN
PID
Set by USB Device
Data OUT
Stall PID
Set by Firmware
Stall PID
Set by Firmware
Interrupt Pending
Interrupt Pending
Set by
USB Device
Cleared by Firmware
Cleared by Firmware
Cleared by Firmware
1768I–ATARM–09-Jul-09