Usb Device Register Definitions; Usb Interrupt Status Register (Usbintst - 0Xe01F C1C0) - Philips LPC214 Series User Manual

Philips Semiconductors
Volume 1
Table 174: USB device register map
Name Description
USBNDDRIntSet USB New DD Request Interrupt Set
USBSysErrIntSt USB System Error Interrupt Status
USBSysErrIntClr USB System Error Interrupt Clear
USBSysErrIntSet USB System Error Interrupt Set
[1]

14.7 USB Device register definitions

14.7.1 USB Interrupt Status register (USBIntSt - 0xE01F C1C0)

The USB device has three interrupt output lines. The interrupts usb_int_req_Ip and
usb_int_req_hp facilitates transfer of data in slave mode. These two interrupt lines are
provided to allow two different priority (high/low) levels in slave mode transfer. Each of the
individual endpoint interrupts can be routed to either high priority or low priority levels
using corresponding bits in the Endpoint Interrupt Priority register
interrupt level is triggered with active high polarity. The external interrupt generation takes
place only if the necessary 'enable' bits are set in the Device Interrupt Enable register
(Section
usb_int_req_dma is raised when an end_of_transfer or a system error has occurred. DMA
data transfer is not dependent on this interrupt.
The three interrupt output lines are ORed together to reduce the number of interrupt
channels required for the USB device in the vectored interrupt controller. This register
reflects the status of the each interrupt line. The USBIntSt is a read/write register.
Table 175: USB Interrupt Status register (USBIntSt - address 0xE01F C1C0) bit description
Bit Symbol
0 USB_INT_REQ_LP
1 USB_INT_REQ_HP
2 USB_INT_REQ_DMA
7:3 -
9397 750 XXXXX
User manual
Reset value reflects the data stored in used bits only. It does not include reserved bits content.
14.7.3). Otherwise, they will be registered only in the status registers. The
Description
Low priority interrupt line status. This bit is read only.
High priority interrupt line status. This bit is read only.
DMA interrupt line status. This bit is read only. (LPC2146/8 only)
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
Rev. 01 — 15 August 2005
UM10139
Chapter 14: USB Device Controller
[1]
Access Reset value
WO 0x0000 0000
RO 0x0000 0000
WO 0x0000 0000
WO 0x0000 0000
(Section
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Address
0xE009 00B4
0xE009 00B8
0xE009 00BC
0xE009 00C0
14.7.11). The
Reset
value
0
0
0
NA
200