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Table 15.4 Relationship between the UTSTR1 Settings and Pin Inputs
Pin Input
VBUS
0/1
X
Register Settings
UCTLR/
UTSTR0/
FADSEL
PTSTE
0
X
1
X
0
0
0
0
0
0
0
0
0
1
0
1
0
1
0
1
0
1
0
1
1
X
1
X
1
X
Legend
X:
Don't care.
0/1:
Register setting equals pin output
—:
Cannot be controlled. Indicates state in normal operation according to the USB operation
and port settings.
15.3.43 USB Test Registers 2 and A to F (UTSTR2, UTSRA to UTSRF)
UTSTR2 and UTSRTA to UTSRTF are test registers and cannot be written to.
Rev. 3.0, 10/02, page 480 of 686
UBPM
UBPM
UBPM
UBPM
X
0/1
Pin Input
UTSTR0/
SUSPEND VBUS
X
0
X
0
X
1
X
1
X
1
X
1
0
1
0
1
0
1
0
1
1
1
1
1
X
1
X
1
X
1
UTSTR1 Monitor
VBUS
0/1
X
P12/
USD+
USD-
RCV
X
X
X
X
X
0/1
0
0
X
0
1
X
1
0
X
1
1
X
0
0
X
0
1
X
1
0
X
1
1
X
0/1
X
X
X
0/1
X
X
X
0/1
X
X
X
X
X
X
UBPM
UBPM
UBPM
UBPM
X
0/1
UTSTR1
Monitor
P11/
P10/
VP
VM
RCV VP VM
X
X
0
X
X
0/1
X
X
X
X
X
0
X
X
1
X
X
X
X
X
X
X
X
0
X
X
1
X
X
X
X
X
0
X
X
0
X
X
0/1
0/1
X
X
X
0/1
X
0
0
0
0
0
0
0
1
1
0
1
1
0
0
0
1
1
0
1
1
0/1 X
X
0/1
X
X
0/1 X
X
0/1
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