Motorola MPC823e Reference Manual page 831

16.10.8.9 USB MASK REGISTER. The 16-bit read/write USB mask register (USBMR) has
the same bit formats as the USB event register. If a bit in the USBMR is one, the
corresponding interrupt in the USBER is enabled. If the bit is zero, the corresponding
interrupt in the USBER will be masked.
USBMR
BIT 0 1 2
FIELD
RESERVED
RESET
0
R/W
R/W
ADDR
16.10.8.10 USB STATUS REGISTER. The 8-bit read-only USB status (USBS) register
allows you to monitor real-time status condition on the USB lines.
USBS
BIT 0 1
FIELD
RESET
R/W
ADDR
Bits 0–6—Reserved
These bits are reserved and must be set to 0.
IDLE—Idle Status
When set, this bit indicates that an idle condition has been detected on the USB lines. It is
cleared when the bus is not idle. Software has to set up a timer to detect the idle state that
occurs after 3ms.
MOTOROLA
3 4 5 6 7
RESET IDLE TXE3
0 0
R/W R/W R/W
x
(IMMR & 0 FFFF0000) + 0
2 3
RESERVED
0
R
(IMMR & 0xFFFF0000) + 0xA17
MPC823e REFERENCE MANUAL
Communication Processor Module
8 9 10 11 12
TXE2 TXE1 TXE0 SOF BSY
0 0 0 0 0
R/W R/W R/W R/W R/W
x
A14
4 5 6
13 14 15
TXB RXB
0 0 0
R/W R/W
7
IDLE
0
R
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