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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
740 of 1441
NXP Semiconductors
UM10503
Chapter 26: LPC43xx/LPC43Sxx USB1 Host/Device controller
8
SLI
-
Not used by the Host controller.
-
-
11:9
-
-
Reserved.
12
HCH
HCHalted
1
RO
0
The RS bit in USBCMD is set to zero. Set by the host controller.
1
The Host Controller sets this bit to one after it has stopped executing
because of the Run/Stop bit being set to 0, either by software or by the
Host Controller hardware (e.g. because of an internal error).
13
RCL
Reclamation
0
RO
0
No empty asynchronous schedule detected.
1
An empty asynchronous schedule is detected. Set by the host controller.
14
PS
Periodic schedule status
This bit reports the current real status of the Periodic Schedule. The Host
Controller is not required to immediately disable or enable the Periodic
Schedule when software transitions the Periodic Schedule Enable bit in the
USBCMD register. When this bit and the Periodic Schedule Enable bit are
the same value, the Periodic Schedule is either enabled (if both are 1) or
disabled (if both are 0).
0
RO
0
The periodic schedule status is disabled.
1
The periodic schedule status is enabled.
15
AS
Asynchronous schedule status
This bit reports the current real status of the Asynchronous Schedule. The
Host Controller is not required to immediately disable or enable the
Asynchronous Schedule when software transitions the Asynchronous
Schedule Enable bit in the USBCMD register. When this bit and the
Asynchronous Schedule Enable bit are the same value, the Asynchronous
Schedule is either enabled (if both are 1) or disabled (if both are 0).
0
0
Asynchronous schedule status is disabled.
1
Asynchronous schedule status is enabled.
16
-
Not used on Host mode.
0
-
17
-
Reserved.
18
UAI
USB host asynchronous interrupt (USBHSTASYNCINT)
0
R/WC
0
This bit is cleared by software writing a one to it.
1
This bit is set by the Host Controller 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
and
the TD was from the asynchronous
schedule. This bit is also set by the Host when a short packet is detected
and
the packet is on the asynchronous schedule. A short packet is when
the actual number of bytes received was less than the expected number of
bytes.
Table 534. USB Status register in host mode (USBSTS_H - address 0x4000 7144) register bit description
…continued
Bit
Symbol
Value
Description
Reset
value
Access