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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SH7041A датащи(PDF) 279 Page - Renesas Technology Corp |
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SH7041A датащи(HTML) 279 Page - Renesas Technology Corp |
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279 / 923 page  241 SAR3 DAR3 Data buffer Memory Transfer source module Transfer destination module Temporary buffer The SAR3 value is taken as the address, memory data is read, and the value is stored in the temporary buffer. Since the value read at this time is used as the address, it must be 32 bits. When external connection data bus is 16 bits, two bus cycles are required. DMAC SAR3 DAR3 Data buffer Memory Transfer source module Transfer destination module Temporary buffer The value in the temporary buffer is taken as the address, and data is read from the transfer source module to the data buffer. SAR3 DAR3 Data buffer Memory Transfer source module Transfer destination module Temporary buffer The DAR3 value is taken as the address, and the value in the data buffer is written to the transfer destination module. Note: Memory, transfer source, and transfer destination modules are shown here. In practice, connection can be made anywhere there is address space. DMAC DMAC 1st, 2nd bus cycles 3rd bus cycle 4th bus cycle Figure 11.9 Dual Address Mode and Indirect Address Operation (When External Memory Space is 16 bits) |
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