Datasheet

Section 14 Universal Serial Bus (USB)
Rev.7.00 Dec. 24, 2008 Page 489 of 698
REJ09B0074-0700
14.3.27 USB Test Register 0 (UTSTR0)
UTSTR0 controls the on-chip transceiver output signals. Setting the PTSTE bit to 1 after setting
UIFRST and UDCRST in UCTLR to 0 specifies the transceiver output signals (USD+ and USD-)
arbitrarily. Table 14.2 shows the relationship between UTSTR0 setting and pin output.
Bit Bit Name Initial Value R/W Description
7 PTSTE 0 R/W Pin Test Enable
Enables the test control for the on-chip transceiver
output pins (USD+ and USD-) and USPND pin.
6 to 4 — All 0 R Reserved
These bits are always read as 0 and cannot be
modified.
3
2
1
0
SUSPEND
OE
FSE0
VPO
0
1
0
0
R/W
R/W
R/W
R/W
On-Chip Transceiver Output Signal Setting
SUSPEND: Sets the USPND pin signal of the on-chip
transceiver.
OE: Sets the output enable (OE) signal of the
on-chip transceiver.
FSE0: Sets the single-ended 0 (FSE0) signal of
the on-chip transceiver.
VPO: Sets the USD+ (VPO) signal of the on-
chip transceiver.