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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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H8S/2218 Scheda tecnica(PDF) 572 Page - Renesas Technology Corp |
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H8S/2218 Scheda tecnica(HTML) 572 Page - Renesas Technology Corp |
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572 / 750 page  Section 14 Universal Serial Bus (USB) Rev.6.00 Jun. 03, 2008 Page 524 of 698 REJ09B0074-0600 (b) EP2 DMA Transfer Procedure The DMAC transfer unit should be one packet. Therefore, set the number of transfers so that it is equal to or less than the maximum packet size of each endpoint. 1. Wait for the UIFR1/EP2READY flag to be set. 2. DMAC settings for EP2 data transfer (such as auto-request and address setting). Read value of UESZ2 and specify number of transfers to match size of received data (64 bytes or less). 3. Activate the DMAC (write 1 to DTE after reading DTE as 0). 4. DMA transfer (transfer of 64 bytes or less). 5. Write 1 to the UTRG0/EP2RDFN bit after the DMA transfer is completed. 6. Repeat steps 1 to 5 above. Write 1 to EP2RDFN Write 1 to EP2RDFN Write 1 to EP2RDFN 64 bytes 64 bytes 22 bytes Figure 14.25 EP2RDFN Operation in UTRG0 (Auto-Request) |
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