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Motorola USB08 Reference Manual: Usb Interrupt Register 0 (uir0); Usb Control Register 0 (ucr0)

Universal serial bus evaluation board using the mc68hc908jb8.
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Universal Serial Bus (USB) Interface
Designer Reference Manual
68
Bit 7
6
Read:
EOPIE
SUSPND
Write:
Reset:
0
0
= Unimplemented
Figure 4-3. USB Interrupt Register 0 (UIR0)
At the end of the USB reset interrupt, the control endpoint 0 will be
enabled for receiving, thus the configuration instructions which follow
after the reset (device requests) are received by the USB receiver. This
option will be enabled by setting the RX0E bit in the USB control register
0 (UCR0).
Bit 7
6
Read:
0
TOSEQ
Write:
Reset:
0
0
= Unimplemented
Figure 4-4. USB Control Register 0 (UCR0)
The USB device is now in the DEFAULT state. That means the device is
attached to the bus and is supplied with current. In addition, it has
received a USB reset and reacts to instructions with the default address
zero. For further information, refer to Universal Serial Bus Specification
Revision 1.1, Chapter 9.1 — USB Device States.
After these fundamental initialization steps, further setup steps
summarized under the term of enumeration follow.
Universal Serial Bus (USB) Interface
5
4
3
TXD2IE
RXD2IE
TXD1IE
0
0
0
5
4
3
TX0E
RX0E
TP0SIZ3
0
0
0
2
1
Bit 0
0
TXD0IE
RXD0IE
0
0
0
2
1
Bit 0
TP0SIZ2
TP0SIZ1
TP0SIZ0
0
0
0
USB08 Evaluation Board
MOTOROLA

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