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UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
597 of 1269
NXP Semiconductors
UM10503
Chapter 24: LPC43xx USB1 Host/Device controller
24.6.3.1 Device mode
Table 463. USB Status register in device mode (USBSTS_D - address 0x4000 7144) register bit description
Bit
Symbol
Value
Description
Reset
value
Access
0
UI
USB interrupt
0
R/WC
0
This bit is cleared by software writing a one to it.
1
This bit is set by the device controller under the
following conditions:
•
when the cause of an interrupt is a
completion of a USB transaction where the
Transfer Descriptor (TD) has an interrupt on
complete (IOC) bit set.
•
when a short packet is detected. A short
packet is when the actual number of bytes
received was less than the expected number
of bytes.
•
when a SETUP packet is received,
1
UEI
USB error interrupt
0
R/WC
0
This bit is cleared by software writing a one to it.
1
When completion of a USB transaction results in
an error condition, this bit is set by the
Host/Device Controller. This bit is set along with
the USBINT bit, if the TD on which the error
interrupt occurred also had its interrupt on
complete (IOC) bit set. The device controller
detects resume signaling only (see
).
2
PCI
Port change detect.
0
R/WC
0
This bit is cleared by software writing a one to it.
1
The Device Controller sets this bit to a one when
the port controller enters the full or high-speed
operational state. When the port controller exits
the full or high-speed operation states due to
Reset or Suspend events, the notification
mechanisms are the USB Reset Received bit
(URI) and the DCSuspend bits (SLI) respectively.
3
-
Not used in Device mode.
4
-
0
Reserved.
5
-
Not used in Device mode.
0
-
6
URI
USB reset received
0
R/WC
0
This bit is cleared by software writing a one to it.
1
When the device controller detects a USB Reset
and enters the default state, this bit will be set to a
one.