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Table 39. System Configuration Register 2 (SYSCON2) (Continued)
Bit
Name
2
CLR_CFG
1:0
Reserved
Table 40. Device Status Register (DEVSTAT)
Bit
Name
15:10
Reserved
9
B_HNP_ENABLE
8
A_HNP_SUPPORT
SPRU761A
Description
If the USB device controller receives a SET_CONFIGURATION with a
configuration value of 0, and if the device is configured, it must write a 1 to the
clear configured (CLR_CFG) bit to inform the command decode that the device
becomes deconfigured (moves to addressed state). The core clears the
DEVSTAT.CFG bit.
Reading this bit always returns 0. Writing 0 into this bit has no effect.
0: No action
1: Allows DEVSTAT.CFG to be cleared
Always read 0
Reserved
This set-only register provides miscellaneous controls for the function. A read
to this register always returns 0.
Description
Reserved
The HNP enable for B-device bit is used for On-The-Go feature
selection purposes. See the On-The-Go Supplement to the USB 2.0
Specification.
0: Not significant
1: HNP enable for B-device
Value after MPU or USB reset is low.
The B-device is directly connected to an A-device port that supports
HNP. This A_HNP_SUPPORT bit is used for On-The-Go feature
selection purposes. See the On-The-Go Supplement to the USB 2.0
Specification.
0: Not significant
1: B-device connection to HNP capable A-device
Value after MPU or USB reset is low.
USB Device Controller
Universal Serial Bus (USB)
83
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