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Section 20 USB Function Module
Rev. 4.00 Sep. 14, 2005 Page 795 of 982
REJ09B0023-0400
20.10.4 Assigning Interrupt Source for EP0
Interrupt sources (bits 0 to 3) for EP0 that are assigned to USBIFR0 of this module must be
assigned to the same interrupt pin using USBISR0.
20.10.5 Clearing FIFO when Setting DMA Transfer
Clearing the endpoint 1 data register (USBEPDR1) is impossible when DMA transfer is enabled
(USBDMAR/EP1DMAE = 1) for endpoint 1. To clear this register, cancel DMA transfer.
20.10.6 Manual Reset for DMA Transfer
Do not input a manual reset during DMA transfer for endpoints 1 and 2. Correct operation cannot
be guaranteed.
20.10.7 USB
Clock
Input the USB clock (UCLK) before setting the register in this module.
20.10.8 Using TR Interrupt
Note that the following when using the transfer request interrupt (TR interrupt) for interrupt-IN
transfer of EP0i/EP2/EP3.
The TR interrupt flag is set when the IN token is sent from the USB host and there is no data in
the FIFO of the EP. However, TR interrupts occur continuously at the timing shown in figure
20.24. Make sure that no malfunction occurs in these cases.
Note: This module checks NAK acknowledgement if there is no data in the FIFO of the EP
when receiving the IN token. However the TR interrupt flag is set after transmitting the
NAK handshake. Therefore, when writing the USBTRG/PKTE bit is later than the next IN
token, the TR interrupt flag is set again.
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...
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