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Section 20 USB Function Module
Rev. 4.00 Sep. 14, 2005 Page 750 of 982
REJ09B0023-0400
20.3.1
USB Interrupt Flag Register 0 (USBIFR0)
Together with USB interrupt flag registers 1 (USBIFR1) and 2 (USBIFR2), USBIFR0 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 0 (USBIER0). Clearing is performed by writing 0
to the bit to be cleared, and 1 to the other bits. However, EP1 FULL and EP2 EMPTY are status
bits, and cannot be cleared.
USBIFR0 is initialized to H
'
10 by a power-on reset.
Bit Bit
Name
Initial
Value R/W
Description
7 BRST
0 R/W
Bus
Reset
Set to 1 when the bus reset signal is detected on the
USB bus.
6 EP1FULL
0 R
EP1
FIFO
Full
This bit is set when endpoint 1 receives one packet of
data normally from the host, and holds a value of 1 as
long as there is valid data in the FIFO buffer. EP1
FULL is a status bit, and cannot be cleared.
5
EP2TR
0
R/W
EP2 Transfer Request
This bit is set if there is no valid transmit data in the
FIFO buffer when an IN token for endpoint 2 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.
4
EP2EMPTY 1
R
EP2 FIFO Empty
This bit is set when at least one of the dual endpoint 2
transmit FIFO buffers is ready for transmit data to be
written. EP2 EMPTY is a status bit, and cannot be
cleared.
3
SETUPTS
0
R/W
Setup Command Receive Complete
This bit is set to 1 when endpoint 0 receives normally
a setup command requiring decoding on the
application side, and returns an ACK handshake to
the host.
Содержание HD6417641
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Страница 11: ...Rev 4 00 Sep 14 2005 Page xi of l USB Universal serial bus WDT Watch dog timer...
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Страница 204: ...Section 4 Clock Pulse Generator CPG Rev 4 00 Sep 14 2005 Page 154 of 982 REJ09B0023 0400...
Страница 212: ...Section 5 Watchdog Timer WDT Rev 4 00 Sep 14 2005 Page 162 of 982 REJ09B0023 0400...
Страница 228: ...Section 6 Power Down Modes Rev 4 00 Sep 14 2005 Page 178 of 982 REJ09B0023 0400...
Страница 246: ...Section 8 X Y Memory Rev 4 00 Sep 14 2005 Page 196 of 982 REJ09B0023 0400...
Страница 318: ...Section 11 User Break Controller UBC Rev 4 00 Sep 14 2005 Page 268 of 982 REJ09B0023 0400...
Страница 454: ...Section 12 Bus State Controller BSC Rev 4 00 Sep 14 2005 Page 404 of 982 REJ09B0023 0400...
Страница 500: ...Section 13 Direct Memory Access Controller DMAC Rev 4 00 Sep 14 2005 Page 450 of 982 REJ09B0023 0400...
Страница 504: ...Section 14 U Memory Rev 4 00 Sep 14 2005 Page 454 of 982 REJ09B0023 0400...
Страница 566: ...Section 17 Compare Match Timer CMT Rev 4 00 Sep 14 2005 Page 516 of 982 REJ09B0023 0400...
Страница 734: ...Section 18 Multi Function Timer Pulse Unit MTU Rev 4 00 Sep 14 2005 Page 684 of 982 REJ09B0023 0400...
Страница 868: ...Section 21 A D Converter Rev 4 00 Sep 14 2005 Page 818 of 982 REJ09B0023 0400...
Страница 914: ...Section 23 I O Ports Rev 4 00 Sep 14 2005 Page 864 of 982 REJ09B0023 0400...
Страница 956: ...Section 24 List of Registers Rev 4 00 Sep 14 2005 Page 906 of 982 REJ09B0023 0400...
Страница 1016: ...Section 25 Electrical Characteristics Rev 4 00 Sep 14 2005 Page 966 of 982 REJ09B0023 0400...
Страница 1024: ...Appendix Rev 4 00 Sep 14 2005 Page 974 of 982 REJ09B0023 0400...
Страница 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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