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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) 79 Page - ams AG |
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AS8267 датащи(HTML) 79 Page - ams AG |
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79 / 136 page  Data Sheet AS8267 / AS8268 Revision 1.0, 19-Jun-07 Page 79 of 136 In order to protect against inadvertent programming the user can see these bits. Please note that the protected range of EEPROM cannot be overwritten via an SCT command there anymore. Reprogramming must be done with a dedicated program then. Instruction Set Instruction Name Instruction Format Description READ 03h Read data from memory starting with selected address WRITE 02h Write data to memory beginning at selected address. Most EEPROMs allow page writing of pages 16, 32, 64 or even more bytes for faster device programming. Before every page write operation a WREN instruction must be applied – see also bootloading and uploading sequence for details. WREN 06h Write enable EEPROM, enables write operation RDSR 05h Read EEPROM Status register WRDI 08h Write disable EEPROM, disable write operation WRSR 01h Write EEPROM Status register SPI Modes These devices can be driven by a microcontroller with its SPI peripheral running in either of the two following modes: - CPOL = 0, CPHA = 0 - CPOL = 1, CPHA = 1 (It is recommended to set CPOL = 1, CPHA = 1 in your program: The build-in bootloader uses this setting as well.) For these two modes, input data is latched in on the rising edge of Serial Clock (SC), and output data is issued on the falling edge of Serial Clock (SC). The recommended mode is shown in Figure 11. The clock polarity SC is ‘1’ when the bus master is in Stand-by mode and not transferring data (idle state): - SC remains at 1 for (CPOL = 1, CPHA = 1) Figure 11: SPI modes recommended EEP_SC(in) EEP_SI(in) EEP_SO(out ) 1 1 |
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