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M24LR16E-R 数据表(PDF) 41 Page - STMicroelectronics |
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M24LR16E-R 数据表(HTML) 41 Page - STMicroelectronics |
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41 / 143 page  M24LR16E-R I2C device operation Doc ID 018932 Rev 8 41/143 5.16.2 I2C write password command description The I2C write password command is used to write a 32-bit block into the M24LR16E-R I2C password system area. This command is used in I2C mode to update the I2C password value. It cannot be used to update any of the RF passwords. After the write cycle, the new I2C password value is automatically activated. The I2C password value can only be modified after issuing a valid I2C present password command. On delivery, the I2C default password value is set to 0000 0000h and is activated. Following a Start condition, the bus master sends a device select code with the Read/Write bit (RW) reset to 0 and the Chip Enable bit E2 at 1. The device acknowledges this, as shown in Figure 13, and waits for the two I2C password address bytes, 09h and 00h. The device responds to each address byte with an acknowledge bit, and then waits for the four password data bytes, the validation code, 07h, and a resend of the four password data bytes. The most significant byte of the password is sent first, followed by the least significant bytes. It is necessary to send twice the 32-bit password to prevent any data corruption during the write sequence. If the two 32-bit passwords sent are not exactly the same, the M24LR16E-R does not modify the I2C password value. When the bus master generates a Stop condition immediately after the Ack bit (during the tenth bit time slot), the internal write cycle is triggered. A Stop condition at any other time does not trigger the internal write cycle. During the internal write cycle, the serial data (SDA) signal is disabled internally, and the device does not respond to any requests. Figure 13. I2C write password command ai15126b Device select code Password address 09h Password address 00h New password [31:24] Ack R/W Ack Ack Ack Device select code = 1010 1 1 1 New password [23:16] New password [15:8] New password [7:0] Ack Ack Ack Ack generated during 9th bit time slot. Validation code 07h Ack New password [31:24] Ack New password [23:16] New password [15:8] New password [7:0] Ack Ack Ack |
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