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Section 20 USB Function Module
Rev. 4.00 Sep. 14, 2005 Page 762 of 982
REJ09B0023-0400
Bit Bit
Name
Initial
Value R/W Description
0 EP0iCLR
0 W
EP0i
Clear
When 1 is written to this bit, the endpoint 0 transmit
FIFO buffer is initialized.
20.3.20 USBDMA Transfer Setting Register (USBDMAR)
USBDMAR enables DMA transfer between the endpoint 1 and endpoint 2 data registers and
memory by means of the on-chip DMA controller (DMAC). Dual address transfer is performed
with the transfer size of only on a per-byte basis. In order to start DMA transfer, DMAC settings
must be made in addition to the settings in this register. For details of DMA transfer, see
section 20.7, DMA Transfer.
USBDMAR can be initialized to H
'
00 by a power-on reset.
Bit Bit
Name
Initial
Value R/W
Description
7 to 2
All
0
R
Reserved
The write value should always be 0.
1
EP2DMAE
0
R/W
Endpoint 2 DMA Transfer Enable
When this bit is set, DMA transfer is enabled from
memory to the endpoint 2 transmit FIFO buffer. If
there is at least one byte of space in the FIFO buffer,
a transfer request is asserted for the DMA controller.
In DMA transfer, when 64 bytes are written to the
FIFO buffer, the EP2 packet enable bit is set
automatically, allowing 64 bytes of data to be
transferred. If there is still space in the other of the
two FIFOs, a transfer request is asserted for the DMA
controller again. However, if the size of the data
packet to be transmitted is less than 64 bytes, the
EP2 packet enable bit is not set automatically, and so
should be set by the CPU with a DMA transfer end
interrupt.
Also, as EP2-related interrupt requests to the CPU
are not automatically masked, interrupt requests
should be masked as necessary in the interrupt
enable register.
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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Страница 1036: ...SH7641 Hardware Manual...