Section 22 USB Function Module (USB)
Rev. 1.00 Mar. 12, 2008 Page 836 of 1178
REJ09B0403-0100
22.3.1
Interrupt Flag Register 0 (IFR0)
IFR0, together with interrupt flag registers 1and 2 (IFR1and IFR2), indicates interrupt status
information required by the application. When an interrupt source is generated, the corresponding
bit is set to 1. And then this bit, in combination with interrupt enable register 0 (IER0), generates
an interrupt request to the CPU. To clear, write 0 to the bit to be cleared and 1 to the other bits.
However, since EP1FULL and EP2EMPTY are status bits, these bits cannot be cleared.
Bit Bit
Name
Initial
Value
R/W Description
7 BRST 0 R/W
Bus
Reset
This bit is set to 1 when a bus reset signal is detected on
the USB bus.
6
EP1FULL
0
R/W
EP1 FIFO Full
[Reading]
This bit is set when endpoint 1 receives one packet of
data successfully from the host, and holds a value of 1
as long as there is valid data in the FIFO buffer. This bit
cannot be cleared.
[Writing]
When the data in endpoint 1 is transferred by the DTC,
writing 0 to this bit clears the request for a DTC transfer
end interrupt. If the DTC transfer is not used, always
write 1 to this bit.
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 NAK handshake is returned to the host until
data is written to the FIFO buffer and packet
transmission is enabled.
Содержание H8S Family
Страница 2: ...Rev 1 00 Mar 12 2008 Page ii of xIviii...
Страница 8: ...Rev 1 00 Mar 12 2008 Page viii of xIviii...
Страница 28: ...Rev 1 00 Mar 12 2008 Page xxviii of xIviii...
Страница 48: ...Rev 1 00 Mar 12 2008 Page xlviii of xIviii...
Страница 70: ...Section 1 Overview Rev 1 00 Mar 12 2008 Page 22 of 1178 REJ09B0403 0100...
Страница 108: ...Section 2 CPU Rev 1 00 Mar 12 2008 Page 60 of 1178 REJ09B0403 0100...
Страница 116: ...Section 3 MCU Operating Modes Rev 1 00 Mar 12 2008 Page 68 of 1178 REJ09B0403 0100...
Страница 152: ...Section 5 Interrupt Controller Rev 1 00 Mar 12 2008 Page 104 of 1178 REJ09B0403 0100...
Страница 206: ...Section 6 Bus Controller BSC Rev 1 00 Mar 12 2008 Page 158 of 1178 REJ09B0403 0100...
Страница 420: ...Section 9 14 Bit PWM Timer PWMX Rev 1 00 Mar 12 2008 Page 372 of 1178 REJ09B0403 0100...
Страница 476: ...Section 12 Watchdog Timer WDT Rev 1 00 Mar 12 2008 Page 428 of 1178 REJ09B0403 0100...
Страница 552: ...Section 14 CRC Operation Circuit CRC Rev 1 00 Mar 12 2008 Page 504 of 1178 REJ09B0403 0100...
Страница 588: ...Section 15 Serial Communication Interface with FIFO SCIF Rev 1 00 Mar 12 2008 Page 540 of 1178 REJ09B0403 0100...
Страница 632: ...Section 17 Synchronous Serial Communication Unit SSU Rev 1 00 Mar 12 2008 Page 584 of 1178 REJ09B0403 0100...
Страница 712: ...Section 18 I2 C Bus Interface IIC Rev 1 00 Mar 12 2008 Page 664 of 1178 REJ09B0403 0100...
Страница 804: ...Section 19 LPC Interface LPC Rev 1 00 Mar 12 2008 Page 756 of 1178 REJ09B0403 0100...
Страница 838: ...Section 20 Ethernet Controller EtherC Rev 1 00 Mar 12 2008 Page 790 of 1178 REJ09B0403 0100...
Страница 964: ...Section 24 RAM Rev 1 00 Mar 12 2008 Page 916 of 1178 REJ09B0403 0100...
Страница 1066: ...Section 25 Flash Memory Rev 1 00 Mar 12 2008 Page 1018 of 1178 REJ09B0403 0100...
Страница 1098: ...Section 26 Boundary Scan JTAG Rev 1 00 Mar 12 2008 Page 1050 of 1178 REJ09B0403 0100...
Страница 1168: ...Section 30 Platform Environment Control Interface PECI Rev 1 00 Mar 12 2008 Page 1120 of 1178 REJ09B0403 0100...
Страница 1226: ...Rev 1 00 Mar 12 2008 Page 1178 of 1178 REJ09B0403 0100...
Страница 1229: ......
Страница 1230: ...H8S 2472 Group H8S 2462 Group Hardware Manual...