Register 153: Universal Serial Bus Power Control (PCUSB), offset 0x928
The PCUSB register controls the power applied to the USB module. The function of this bit depends
on the current state of the device (Run, Sleep or Deep-Sleep mode) and value of the corresponding
bits in the RCGCUSB, SCGCUSB and DCGCUSB registers. If the Rn, Sn, or Dn bit of the respective
RCGCUSB, SCGCUSB and DCGCUSB registers is 1 and the device is in that mode, the module
is powered and receives a clock irrespective of what the corresponding Pn bit in the PCUSB register
is.
However, if the Rn, Sn, or Dn bit of the respective RCGCUSB, SCGCUSB and DCGCUSB registers
is 0 and the device is in that mode, then the module behaves differently depending on the value of
the corresponding Pn bit in the PCUSB register. In this case, when the Pn bit is clear the module
is not powered and does not receive a clock. If the Pn bit is set, the module is powered but does
not receive a clock. The table below details the differences.
Table 5-25. Module Power Control
DescriptionPnRn, Sn or Dn Value in
Respective RCGCx,
SCGCx, or DCGCx
Register
Module is not powered and does not receive a clock. In this case, the peripheral's
state is not retained.
This is the lowest power consumption state of any peripheral since it consumes no
dynamic nor leakage current. Hardware should perform a peripheral reset if the active
mode changes and the RCGCx, SCGCx, or DCGCx register is a 1 or the P0 bit is
changed to a 1.
Software must re-initialize the peripheral when re-enabled due to the loss of state.
00
Module is powered, but does not receive a clock.
In this case, the peripheral is inactive. This is the second-lowest power consumption
of any peripheral since it consumes only leakage current.
10
Module is powered and receives a clock.X1
Universal Serial Bus Power Control (PCUSB)
Base 0x400F.E000
Offset 0x928
Type RW, reset 0x0000.0001
16171819202122232425262728293031
reserved
ROROROROROROROROROROROROROROROROType
0000000000000000Reset
0123456789101112131415
P0reserved
RWROROROROROROROROROROROROROROROType
1000000000000000Reset
DescriptionResetTypeNameBit/Field
Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
0ROreserved31:1
June 18, 2014476
Texas Instruments-Production Data
System Control
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