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7643 Datasheet(PDF) 108 Page - Renesas Technology Corp |
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7643 Datasheet(HTML) 108 Page - Renesas Technology Corp |
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108 / 424 page  Rev.2.00 Aug 28, 2006 page 91 of 103 REJ09B0133-0200 OVERVIEW FLASH MEMORY MODE 7643 Group qDownload Command This command downloads a program to the RAM for execution. Execute the download command as explained here following. (1) Transfer the “FA16” command code with the 1st byte. (2) Transfer the program size with the 2nd and 3rd bytes. (3) Transfer the check sum with the 4th byte. The check sum is added to all data sent with the 5th byte onward. (4) The program to execute is sent with the 5th byte onward. When all data has been transmitted, if the check sum matches, the downloaded program is executed. The size of the program will vary according to the internal RAM. Fig. 87 Timing for download FA16 Program data Program data Data size (low) Check sum SCLK SRXD STXD SRDY (BUSY) Data size (high) |
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