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7643 bảng dữ liệu(PDF) 212 Page - Renesas Technology Corp

tên linh kiện 7643
Giải thích chi tiết về linh kiện  8-BIT SINGLE-CHIP MICROCOMPUTER
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
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Rev.2.00
Aug 28, 2006
page 91 of 202
7643 Group
REJ09B0133-0200
APPLICATION
2.5 DMAC
2.5.6 DMAC application example
(1) Transfer from external FIFO to USB FIFO
Outline: Data are transferred from external FIFOs to USB FIFOs.
Specifications: •A burst transfer is used and 128-byte (128 bytes/packet) continuous transfer is
performed. The external FIFO size must be set as 128 bytes of an integral multiple.
•If the data is deficient in the external FIFO, the DMAC channel 0 transferring is
stopped in the DMAC channel 0 interrupt routine process. The DMA transfer is
resumed in the main routine process when the data is sufficient.
•To confirm the external FIFO state after completion of 128 bytes transferring, set
the DMAC channel x disable after count register underflow enable bit (DxDAUE)
to “1”.
•USB endpoint 2 IN_PKT_RDY (falling edge) selected as hardware transfer request
source.
Figures 2.5.16 and 2.5.17 show a setting of the related registers and Figure 2.5.18 shows a control
procedure.
If data are transferred from USB FIFOs to external FIFOs as well as this, use USB endpoint 2
OUT_PKT_RDY (rising edge) selected as hardware transfer request source.



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