ATSAM3U-EK Atmel, ATSAM3U-EK Datasheet - Page 964

• Manufacturer Part Number: ATSAM3U-EK
• Description: KIT EVAL FOR AT91SAM3U CORTEX
• Manufacturer: Atmel
• Type: MCUr

Specifications of ATSAM3U-EK

• Contents: Board
• Processor To Be Evaluated: SAM3U
• Data Bus Width: 32 bit
• Interface Type: RS-232, USB
• Operating Supply Voltage: 3 V
• Silicon Manufacturer: Atmel
• Core Architecture: ARM
• Core Sub-architecture: Cortex - M3
• Silicon Core Number: SAM3U4E
• Silicon Family Name: SAM3U
• Kit Contents: Board CD Docs
• Rohs Compliant: Yes
• For Use With/related Products: AT91SAM3U
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

39.6.8.15
964
964
SAM3U Series
SAM3U Series
STALL
STALL is returned by a function in response to an IN token or after the data phase of an OUT or
in response to a PING transaction. STALL indicates that a function is unable to transmit or
receive data, or that a control pipe request is not supported.
To stall an endpoint, set the FRCESTALL bit in UDPHS_EPTSETSTAx register and after the
STALL_SNT flag has been set, set the TOGGLE_SEG bit in the UDPHS_EPTCLRSTAx
register.
Set the FRCESTALL bit in UDPHS_EPTSETSTAx register.
Figure 39-15. Stall Handshake Data OUT Transfer
Figure 39-16. Stall Handshake Data IN Transfer
• OUT
• IN
USB Bus
Packets
FRCESTALL
STALL_SNT
USB Bus
Packets
FRCESTALL
STALL_SNT
Token OUT
Set by Firmware
Token IN
Set by Firmware
Data OUT
Stall PID
Set by Hardware
Set by Hardware
Stall PID
Interrupt Pending
Interrupt Pending
Cleared by Firmware
Cleared by Firmware
Cleared by Firmware
Cleared by Firmware
6430D–ATARM–25-Mar-11
6430D–ATARM–25-Mar-11