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L9396 数据表(PDF) 91 Page - STMicroelectronics |
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L9396 数据表(HTML) 91 Page - STMicroelectronics |
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91 / 109 page  DS12539 Rev 6 91/109 L9396 Serial Peripheral Communication 108 8.3 SPI registers The register table is on 10 pages containing 16 registers each. Address 3 MSBs indicate page selection, the remaining address 4 LSBs indicates the register. Maximum word length of registers is 20 bits. The bits colored in gray are called safe registers. After the safe registers set has been written, the MCU sends a lock frame writing the lock word h-AAAAA into the write-protection register (address b-1000010). From now on, it's mandatory to write consecutively the unlock words h-55555 (first access) and h-33333 (second access) into the write-protection register in order to write again the safe registers set. The write-protection register echo (SDO) reports the lock-state: h-AAAAA in case of lock or h-55555 in case of unlock. The write-protection register initial status is unlock. The summary of the registers is defined in Table 60. |
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