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USB Register Definitions
The following sections provide the USB register definitions. In these sections:
The register mnemonic is provided for reference purposes.
The register address shown is the address location of the register in the CRB.
The initialization value shown is the register’s initialization value at reset.
Interrupt Status Register
The Interrupt Status register contains bits for each of the interrupt sources in the USB. Each bit
is qualified with its respective interrupt enable bits. All bits of the register are logically OR’ed
together to form a single interrupt source for the microprocessor. Once an interrupt bit has
been set, it can only be cleared by writing a one to the respective interrupt bit.
The Interrupt Mask contains enable bits for each of the interrupt sources within the USB.
Setting any of these bits will enable the respective interrupt source in the register. This register
contains the hex value 0000 after a reset (all interrupts disabled).
Table 4-8. Interrupt Status Register
BIT
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
OFFSET
00h
Interrupt Mask Interrupt Status
FIELD
STALL
ATTACH
RESUME
SLEEP
TOK_DNE
SOF_TOK
ERROR
USB_RST
STALL
ATTACH
RESUME
SLEEP
TOK_DNE
SOF_TOK
ERROR
USB_RST
RESET
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
RW RW RW RW RW RW RW RW RW RW RW RW RW RW RW RW RW
Table 4-9. 16- Interrupt Status Register Definitions
Bits Field Name Description
15 STALL
Enable/Disable STALL Interrupt
1 = enable the STALL interrupt.
0 = disable the STALL interrupt (default).
14 ATTACH
Enable/Disable ATTACH Interrupt
1 = enable the ATTACH interrupt.
0 = disable the ATTACH interrupt (default).
13 RESUME
Enable/Disable RESUME Interrupt
1 = enable the RESUME interrupt.
0 = disable the RESUME interrupt (default).
12 SLEEP
Enable/Disable SLEEP Interrupt
1 = enable the SLEEP interrupt.
0 = disable the SLEEP interrupt (default).
11 TOK_DNE
Enable/Disable TOK_DNE Interrupt
1 = enable the TOK_DNE interrupt.
0 = disable the TOK_DNE interrupt (default).
10 SOF_TOK
Enable/Disable SOF_TOK Interrupt
1 = enable the SOF_TOK interrupt.
0 = disable the SOF_TOK interrupt (default).
9 ERROR
Enable/Disable ERROR Interrupt
1 = enable the ERROR interrupt.
0 = disable the ERROR interrupt (default).