Datasheet

Table Of Contents
Section 15 Universal Serial Bus Interface (USB)
REJ09B0140-0900 Rev. 9.00 Page 541 of 846
Sep 16, 2010
H8S/2215 Group
15.3.48 USB Test Register 1 (UTSTR1)
UTSTR1 allows internal or external transceiver input signals to be monitored. When the FADSEL
bit of UCTLR is set to 0, internal transceiver input signals can be monitored. When the FADSEL
bit is FADSEL = 1, external transceiver input signals can be monitored. Table 15.4 shows the
relationship between UTSTR1 settings and pin inputs.
Bit Bit Name Initial Value R/W Description
7
6
VBUS
UBPM
*
*
R
R
Internal/External Transceiver Input Signal Monitor Bits
VBUS: Monitors VBUS pin
UBPM: Monitors UBPM pin
5 to 3 Al 0 R Reserved
These bits are always read as 0 and cannot be
modified.
2
1
0
RCV
VP
VM
*
*
*
R
R
R
Internal/External Transceiver Input Signal Monitor Bits
RCV: Monitors the RCV signal of the internal/external
transceiver
VP: Monitors the VP signal of the internal/external
transceiver
VM: Monitors the VM signal of the internal/external
transceiver
Note: * Determined by the status of the VBUS, UBPM, USD+, USD-, RCV, VP, and VM pins.