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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATXP032 датащи(PDF) 28 Page - Dialog Semiconductor |
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ATXP032 датащи(HTML) 28 Page - Dialog Semiconductor |
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28 / 113 page  26 ATXP032 DS-ATXP032–114I–4-2020 Figure 8-12. Timing Diagram for Two Consecutive Accesses in Octal Mode — DDR See the bullet items on page 23 regarding the value of the I/O lines while the clock is stopped. 8.3 Buffer Read (D4h) The SRAM data buffers can be accessed independently from the main memory array, and utilizing the Buffer Read command allows data to be sequentially read directly from the buffer. To perform a Buffer Read, the command D4h must be clocked into the device followed by four address bytes comprised of 24 dummy bits and 8 buffer address bits (BFA 7 - BFA0). Following the address bytes, one dummy byte must be clocked into the device to initialize the read operation. The CS pin must remain low during the loading of the command, the address bytes, the dummy byte and the reading of data. When the end of a buffer is reached, the device continues reading back at the beginning of the buffer. A low-to-high transition on the CS pin terminates the read operation and tri-state the output pin (SO). Note that the Buffer Read command is only allowed in Standard SPI Mode. D5 D4 D1 D0 D6 D2 D7 D3 D5 D4 D1 D0 D6 D2 D7 D3 D5 D4 D1 D0 D6 D2 D7 D3 D5 D4 D1 D0 D6 D2 D7 D3 MSB MSB See Note See Note See Note See Note See Note See Note See Note See Note MSB MSB Byte 0 Byte 1 Byte n Byte n-1 I/O0 (SI) SCK I/O1 (SO) I/O2 (WP) I/O3 CS I/O4 I/O5 I/O6 I/O7 DS First byte of next group Last byte of previous group |
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