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Preliminary
USB2.0 DEVICE
S3C2451X RISC MICROPROCESSOR
17-16
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
EP0 STATUS REGISTER (EP0SR)
This register stores status information of the Endpoint 0. These status information are set automatically by the
core when corresponding conditions are met. After reading the bits, MCU should write 1 to clear them.
Register Address
R/W
Description
Reset
Value
EP0SR
0x4980_0024
R/W
EP0 Status Register
0x0
EP0SR Bit
R/W
Description
Initial
State
[31:7]
Reserved
LWO
[6]
R
Last Word Odd
LWO informs that the last word of a packet in FIFO has an
invalid upper byte. This bit is cleared automatically after the
MCU reads it from the FIFO.
0
[5]
Reserved
SHT
[4]
R/C
Stall Handshake Transmitted
SHT informs that STALL handshake due to stall condition is
sent to Host. This bit is an interrupt source. This bit is
cleared when the MCU writes 1.
0
[3:2]
Reserved
TST
[1]
R/C
Tx successfully received
TST is set by core after core sends TX data to Host and
receives ACK successfully. TST is one of the interrupt
sources.
0
RSR
[0]
R/C
Rx successfully received.
RSR is set by core after core receives error free packet from
Host and sent ACK back to Host successfully. RSR is one of
the interrupt sources.
0