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AS8218 数据表(PDF) 75 Page - ams AG |
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AS8218 数据表(HTML) 75 Page - ams AG |
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75 / 123 page  Data Sheet AS8218 / AS8228 Revision 3.0, 31-May-06 Page 75 of 123 Figure 18: Page write (WRITE) sequence Uploading Programs using the SCT In order to allow direct access to the EEPROM via a standard RS232 interface the AS8218 / AS8228 ICs provide a UART to SPI protocol converter. The two system control (SCT) instructions involved are called READ_P (F3h) and WRITE_P (F4h), which may be used to upload user software or user data to the EEPROM. Doing a READ_P allows the verification of the written data, respectively. Example Write EEPROM via UART to SPI Converter: UART WRITE_P Address Block Length Data1 Data2 WAIT Prog.Time ACKN RXD F4 1F F0 00 02 21 42 - - TXD - - - - - - - - FA SPI WREN Write RDSR EEP_SI 06 02 1F F0 00 00 21 42 05 - EEP_SO x x x x x x x x loop until WIP=0 ‘xxxx xxx0’ - EEP_S_N(in) EEP_SC(in) EEP_SI(in) EEP_S_N(in) EEP_SC(in) EEP_SI(in) |
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