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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
660 of 1441
NXP Semiconductors
UM10503
Chapter 25: LPC43xx/LPC43Sxx USB0 Host/Device/OTG controller
25.6.6 Frame index register (FRINDEX)
25.6.6.1 Device mode
In Device mode this register is read only, and the device controller updates the
FRINDEX[13:3] register from the frame number indicated by the SOF marker. Whenever a
SOF is received by the USB bus, FRINDEX[13:3] will be checked against the SOF
marker. If FRINDEX[13:3] is different from the SOF marker, FRINDEX[13:3] will be set to
the SOF value and FRINDEX[2:0] will be set to zero (i.e. SOF for 1 ms frame). If
FRINDEX [13:3] is equal to the SOF value, FRINDEX[2:0] will be incremented (i.e. SOF
for 125
s micro-frame) by hardware.
5
AAE
Interrupt on asynchronous advance enable
When this bit is a one, and the Interrupt on Async Advance bit in the USBSTS register
is a one, the host controller will issue an interrupt at the next interrupt threshold. The
interrupt is acknowledged by software clearing the Interrupt on Async Advance bit.
R/W
0
6
-
Not used by the Host controller.
-
0
7
SRE
If this bit is one and the SRI bit in the USBSTS register is one, the host controller will
issue an interrupt. In host mode, the SRI bit will be set every 125
s and can be used
by the host controller as a time base. The interrupt is acknowledged by software
clearing the SRI bit in the USBSTS register.
-
0
8
-
Not used by the Host controller.
-
0
15:9
-
Reserved
16
-
Not used by the host controller.
R/W
0
17
-
Reserved
18
UAIE
USB host asynchronous interrupt enable
When this bit is a one, and the USBHSTASYNCINT bit in the USBSTS register is a
one, the host controller will issue an interrupt at the next interrupt threshold. The
interrupt is acknowledged by software clearing the USBHSTASYNCINT bit.
R/W
0
19
UPIA
USB host periodic interrupt enable
When this bit is a one, and the USBHSTPERINT bit in the USBSTS register is a one,
the host controller will issue an interrupt at the next interrupt threshold. The interrupt is
acknowledged by software clearing the USBHSTPERINT bit.
R/W
0
31:20 -
Reserved
Table 475. USB Interrupt register in host mode (USBINTR_H - address 0x4000 6148) bit description
…continued
Bit
Symbol Description
Access Reset
value
Table 476. USB frame index register in device mode (FRINDEX_D - address 0x4000 614C) bit
description
Bit
Symbol
Description
Reset value
Access
2:0
FRINDEX2_0
Current micro frame number
N/A
RO
13:3
FRINDEX13_3
Current frame number of the last frame
transmitted
N/A
RO
31:14
-
Reserved
N/A