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Section 20 USB Function Module
Rev. 4.00 Sep. 14, 2005 Page 752 of 982
REJ09B0023-0400
Bit Bit
Name
Initial
Value R/W
Description
2
EP3TR
0
R/W
EP3 Transfer Request
This bit is set if there is no valid transmit data in the
FIFO buffer when an IN token for endpoint 3 is
received from the host. A NACK handshake is
returned to the host until data is written to the FIFO
buffer and packet transmission is enabled.
1
EP3TS
0
R/W
EP3 Transmit Complete
This bit is set when data is transmitted to the host
from endpoint 3 and an ACK handshake is returned.
0
VBUS
0
R/W
UBS Disconnection Detection
This bit is set to 1 when a function is connected to or
disconnected from the USB bus. Use the VBUSCNT
pin of this module to detect connection/disconnection.
20.3.3
USB Interrupt Flag Register 2 (USBIFR2)
Together with USB interrupt flag registers 0 (USBIFR0) and 1 (USBIFR1), USBIFR2 indicates
interrupt status information required by the application. When an interrupt occurs, the
corresponding bit is set to 1 and an interrupt request is sent to the CPU according to the
combination with USB interrupt enable register 2 (USBIER2). Clearing is performed by writing 0
to the bit to be cleared, and 1 to the other bits. However, CFGV is a status bit, and cannot be
cleared. USBIFR2 is initialized to H
'
20 by a power-on reset.
Bit Bit
Name
Initial
Value R/W Description
7
6
5
4
0
0
1
0
R
R
R
R
Reserved
The write value should always be 0.
3 AWAKE
0 R/W
Awake
Signal Detection
This bit is set to 1 when the resume or bus reset signal
is detected on the USB bus in the suspend state with
USBCTRL/SUSPEND = 1.
2
SUSPS
0
R/W
USB Suspend Signal Detection
This bit is set to 1 when the USB suspend signal is
detected with USBCTRL/SUSPEND = 1.
Summary of Contents for HD6417641
Page 2: ...Rev 4 00 Sep 14 2005 Page ii of l...
Page 7: ...Rev 4 00 Sep 14 2005 Page vii of l...
Page 11: ...Rev 4 00 Sep 14 2005 Page xi of l USB Universal serial bus WDT Watch dog timer...
Page 12: ...Rev 4 00 Sep 14 2005 Page xii of l...
Page 28: ...Rev 4 00 Sep 14 2005 Page xxviii of l...
Page 204: ...Section 4 Clock Pulse Generator CPG Rev 4 00 Sep 14 2005 Page 154 of 982 REJ09B0023 0400...
Page 212: ...Section 5 Watchdog Timer WDT Rev 4 00 Sep 14 2005 Page 162 of 982 REJ09B0023 0400...
Page 228: ...Section 6 Power Down Modes Rev 4 00 Sep 14 2005 Page 178 of 982 REJ09B0023 0400...
Page 246: ...Section 8 X Y Memory Rev 4 00 Sep 14 2005 Page 196 of 982 REJ09B0023 0400...
Page 318: ...Section 11 User Break Controller UBC Rev 4 00 Sep 14 2005 Page 268 of 982 REJ09B0023 0400...
Page 454: ...Section 12 Bus State Controller BSC Rev 4 00 Sep 14 2005 Page 404 of 982 REJ09B0023 0400...
Page 504: ...Section 14 U Memory Rev 4 00 Sep 14 2005 Page 454 of 982 REJ09B0023 0400...
Page 566: ...Section 17 Compare Match Timer CMT Rev 4 00 Sep 14 2005 Page 516 of 982 REJ09B0023 0400...
Page 868: ...Section 21 A D Converter Rev 4 00 Sep 14 2005 Page 818 of 982 REJ09B0023 0400...
Page 914: ...Section 23 I O Ports Rev 4 00 Sep 14 2005 Page 864 of 982 REJ09B0023 0400...
Page 956: ...Section 24 List of Registers Rev 4 00 Sep 14 2005 Page 906 of 982 REJ09B0023 0400...
Page 1016: ...Section 25 Electrical Characteristics Rev 4 00 Sep 14 2005 Page 966 of 982 REJ09B0023 0400...
Page 1024: ...Appendix Rev 4 00 Sep 14 2005 Page 974 of 982 REJ09B0023 0400...
Page 1032: ...Rev 4 00 Sep 14 2005 Page 982 of 982 REJ09B0023 0400 X X Y data addressing 52 X Y memory 193...
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