ISP1160
Embedded USB Host Controller
Philips Semiconductors
To re-enable the interrupt generation:
1. Set all bits in the HcµPInterrupt register.
2. Set the InterruptPinEnable bit to logic 1.
Remark: The InterruptPinEnable bit in the HcHardwareConfiguration register latches
the interrupt output. When this bit is set to logic 0, the interrupt output will remain
unchanged, regardless of any operations on the interrupt control registers.
If INT1 is asserted, and the Host Controller Driver (HCD) wishes to temporarily mask
off the INT signal without clearing the HcµPInterrupt register, the following procedure
should be followed:
1. Make sure that the InterruptPinEnable bit is set to logic 1.
2. Clear all bits in the HcµPInterruptEnable register.
3. Set the InterruptPinEnable bit to logic 0.
To re-enable the interrupt generation:
1. Set all bits in the HcµPInterruptEnable register according to the HCD
requirements.
2. Set the InterruptPinEnable bit to logic 1.
9. Host Controller (HC)
9.1 HC’s four USB states
The ISP1160’s USB HC has four USB states—USBOperational, USBReset,
USBSuspend and USBResume—that define the HC’s USB signalling and bus states
responsibilities. The signals are visible to the Host Controller Driver (HCD) via the
ISP1160 USB HC’s control registers.
9397 750 11371
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
Product data
Rev. 04 — 04 July 2003
16 of 88
NXP [ NXP ]
