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AS3955 データシート(PDF) 55 Page - ams AG |
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AS3955 データシート(HTML) 55 Page - ams AG |
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55 / 111 page  ams Datasheet Page 55 [v1-01] 2015-Apr-29 Document Feedback AS3955 − Detailed Description Wired Interfaces AS3955 host interface can be configured to be either SPI or I²C at production (Fabrication Data FAB_CFG0). In both cases, the /SS signal is also used to control the IC power state. By pulling the /SS low, the chip interface or the chip itself is enabled / powered (see Power Management). Note that interrupting SPI / I²C operations or issuing incomplete command sequence from the MCU may result in corrupted data content. For more information on EEPROM and buffer data reading and writing see EEPROM Read and Write and Data Buffer sections. SPI / I²C Access Modes Figure 56: Access Modes Mode MODE Byte (com. bits) MODE Related Data MODE Trailer M2 M1 M0 C4 C3 C2 C1 C0 Register Write 0 0 0 A4 A3 A2 A1 A0 Data byte(s) Register Read 0 0 1 A4 A3 A2 A1 A0 Data byte(s) EEPROM Write 0 1 0 00 000 Block Address byte 4 bytes of block data EEPROM Read 0 1 1 11 111 Block Address byte N*4 bytes Buffer Load 1 0 0 xxx xx Data byte(s) Buffer Read 1 0 1 xxx xx Data byte(s) COMMAND Mode 1 1 C5 C4 C3 C2 C1 C0 |
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