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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
701 of 1441
NXP Semiconductors
UM10503
Chapter 25: LPC43xx/LPC43Sxx USB0 Host/Device/OTG controller
It is also not necessary to initially prime Endpoint 0 because the first packet received will
always be a setup packet. The contents of the first setup packet will require a response in
accordance with USB device framework command set (see
USB Specification Rev. 2.0
,
chapter 9
).
25.10.2 Port state and control
From a chip or system reset, the device controller enters the Powered state. A transition
from the Powered state to the Attached state occurs when the Run/Stop bit is set to a ‘1’.
After receiving a reset on the bus, the port will enter the defaultFS or defaultHS state in
accordance with the reset protocol described in
Appendix C.2 of the USB Specification
Rev. 2.0
. The following state diagram depicts the state of a USB 2.0 device.
Fig 70. Device state diagram
Powered
Attached
Default
FS/HS
Suspended
FS/HS
set Run/Stop bit
to Run mode
inactive state
Address
FS/HSS
Configured
FS/HS
Suspended
FS/HS
Suspended
FS/HS
when the host
resets, the device
returns to default
state
power
interruption
active state
reset
Su
address
asigned
device
configured
device
deconfigured
bus inactive
bus inactive
bus inactive
bus activity
bus activity
bus activity
software only state