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AS5403D-HTST Datasheet(PDF) 29 Page - ams AG |
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AS5403D-HTST Datasheet(HTML) 29 Page - ams AG |
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29 / 66 page ![]() ams Datasheet Page 29 [v1-06] 2015-Aug-28 Document Feedback AS5403A/D/E − 4-Wire Serial Peripheral Interface (SPI) Read (1) The read command is composed by 2 frames, in the first one the external master sends the command, the even parity and the address to be read on the SDO line (the last 16 bits are ignored). The device forces the SDO pin low. Figure 32: SPI Read After the switching time (TSCSL) the device drives the SDO line and when the SCS pin goes high starts to send out the answer. The first byte of the second frame is composed by the command the device is executing, the even parity and the MSBs of the address required in the previous frame (AD<10:8>). The second byte of the command is the remaining part of the address AD<7:0>, the third and the fourth bytes are the data word at the required address (AD<10:0>). With this command it is possible to access the EEPROM locations and the read/write registers area. SDI SDO SCLK SCS CMD 0 0 PAR AD 10 AD9 AD8 AD7 AD6 AD5 AD4 AD3 AD 2 AD1 AD0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 |
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