USBIEN
USB Interrupt Enable
7FAE
b7
b6
b5
b4
b3
b2
b1
b0
-
-
IBNIE*
URESIE
SUSPIE
SUTOKIE
SOFIE
SUDAVIE
R/W
0
R/W
0
R/W
0
R/W
0
R/W
0
R/W
0
R/W
0
R/W
0
* AN2122/AN2126 only.
Figure 12-20. USB Interrupt Enable Register
USBIEN bits gate the interrupt request to the 8051 for USB reset, suspend, SETUP token,
start of frame, and SETUP data available.
Bit 5:
IBNIE
IN bulk NAK Interrupt Enable
This bit is in the AN2122 and AN2126 versions only. The 8051 sets this bit to enable the
IN-bulk-NAK interrupt. This interrupt occurs when the host sends an IN token to a bulk
IN endpoint which has not been armed by the 8051 writing its byte count register. Indi-
vidual enables and requests (per endpoint) are controlled by the IBNIRQ and IBNIEN reg-
isters (7FB0, 7FB1).
Bit 4:
URESIE
USB Reset Interrupt Enable
This bit is the interrupt mask for the URESIR bit. When this bit is “1,” the interrupt is
enabled, when it is “0,” the interrupt is disabled.
Bit 3:
SUSPIE
USB Suspend Interrupt Enable
This bit is the interrupt mask for the SUSPIR bit. When this bit is “1,” the interrupt is
enabled, when it is “0,” the interrupt is disabled.
Bit 2:
SUTOKIE SETUP Token Interrupt Enable
This bit is the interrupt mask for the SUTOKIR bit. When this bit is “1,” the interrupt is
enabled, when it is “0,” the interrupt is disabled.
Page 12-24
Chapter 12. EZ-USB Registers
EZ-USB TRM v1.9
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