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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AS8267 датащи(PDF) 72 Page - ams AG |
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AS8267 датащи(HTML) 72 Page - ams AG |
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72 / 136 page  Data Sheet AS8267 / AS8268 Revision 1.0, 19-Jun-07 Page 72 of 136 8.5.2. SPI_FLASH Mode In this mode the SPI operates in slave mode, in which the interface is used to communicate with the internal Flash memory. The SPI_Flash block contains an 8-bit instruction register. It is accessed via the MISO pin, with data being clocked in on the rising edge of SC. The S_N pin must be low. The table below contains the list of the possible instruction bytes and format for SPI_Flash block operation. All instructions, addresses, and data are transferred MSB first, LSB last. Data is sampled on the first rising edge of SC after S_N goes low. Instruction Set Instruction Name Instruction Code Description READ 03h Read data from memory array beginning at selected address PP 02h Page Program, moves data to selected memory page WREN 06h Set write enable latch (enable write and erase operations) WRDI 04h Reset the write enable latch (disable write operations) RDSR 05h Read Flash status register (FLASH_STAT, 9700h) WRSR 01h Write Flash status register (FLASH_STAT, 9700h) PE D8h Page Erase ME C7h Mass Erase RESET E9h Sets external reset pin (may be used to reset the whole device) Functional Description Arbitration After a write, page erase or mass erase command the Flash memory is busy for some time and no command must be sent. To handle concurrent access from MCU and the MCU independent interfaces (UART1, SPI via SPI_Flash) to the Flash memory an arbitration procedure is necessary for the external interfaces: 1. Send a request to the Flash (Set REQ bit in FLASH_STAT register) 2. Poll status of Flash until Flash is ready (WIP bit in FLASH_STAT register must be 0) -> Flash memory is reserved for external interface and MCU remains halted. 3. Send one or several Flash commands (Flash must not be busy before sending the next Flash command) 4. Release Flash request (Clear REQ bit in FLASH_STAT register) -> MCU is running again Request is needed for all Flash commands Concurrent access of both MCU independent interfaces is not allowed. |
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