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X76F641WEG Datasheet(PDF) 9 Page - IC MICROSYSTEMS |
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X76F641WEG Datasheet(HTML) 9 Page - IC MICROSYSTEMS |
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9 / 17 page  X76F641 9 Figure 9. Reset Password Figure 10. Reset Device Reset Password Reset Password 7 Reset Password 0 S SDA Wait tWC OR ACK POLLING S ACK Polling Repeated COMMAND Command S If ACK, then Device reset COMMAND 7025 FM 14 Reset Device Reset Password 7 Reset Password 0 S SDA Wait tWC OR ACK POLLING S ACK Polling Repeated COMMAND Command S If ACK, then Device reset COMMAND 7025 FM 15 RESPONSE TO RESET (DEFAULT = 19 41 AA 55) The ISO Response to reset is controlled by the RST and CLK pins. When RST is pulsed high during a clock pulse, the device will output 32 bits of data, one bit per clock, and it resets to the standby state. This conforms to the ISO standard for “synchronous response to reset”. The part must not be in a write cycle for the response to reset to occur. After initiating a nonvolatile write cycle the RST pin must not be pulsed until the nonvolatile write cycle is complete. If not, the ISO response will not be activated. If the RST is pulsed HIGH and the CLK is within the RST pulse (meet the tNOL spec.) in the middle of an ISO transaction, it will output the 32 bit sequence again (starting at bit 0). Otherwise, this aborts the ISO operation and the part returns to standby state. If the RST is pulsed HIGH and the CLK is outside the RST pulse (in the middle of an ISO transaction), this aborts the ISO operation and the part returns to standby state. If there is power interrupted during the Response to Reset, the response to reset will be aborted and the part will return to the standby state. A Response to Reset is not available during a nonvolatile write cycle. |
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