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X76F101S-3.0 Datasheet(PDF) 7 Page - IC MICROSYSTEMS |
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X76F101S-3.0 Datasheet(HTML) 7 Page - IC MICROSYSTEMS |
7 / 17 page X76F101 7 PASSWORDS Passwords are changed by sending the "change read password" or "change write password" commands in a normal sector write operation. A full eight bytes containing the new password must be sent, following successful transmission of the current write password and a valid password ACK response. The user can use a repeated ACK Polling command to check that a new password has been written correctly. An ACK indicates that the new password is valid. There is no way to read any of the passwords. RESPONSE TO RESET (DEFAULT = 19 01 AA 55) The ISO Response to reset is controlled by the RST, CS and CLK pins. When RST is pulsed high, while CS is low, the device will output 32 bits of data, one bit per clock. This conforms to the ISO standard for “synchronous response to reset”. CS must remain LOW and 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. Also, any attempt to pulse the RST pin in the middle of an ISO transaction will stop the transaction with the SDA pin in high impedance. The user will have to issue a stop condition and start the transaction again. If at any time during the Response to Reset CS goes HIGH, 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. Continued clocks after the 32 bits, will output the 32 bit sequence again, starting at byte 0. Figure 7. Response to RESET (RST) CS SCK SO RST Byte 0 MSB LSB LSB MSB 1 LSB MSB LSB MSB 2 3 ABSOLUTE MAXIMUM RATINGS* Temperature under Bias.....................–65°C to +135°C Storage Temperature..........................–65°C to +150°C Voltage on any Pin with Respect to VSS....................................... –1V to +7V D.C. Output Current .................................................. 5mA Lead Temperature (Soldering, 10 seconds)..................................300°C *COMMENT Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and the functional operation of the device at these or any other conditions above those listed in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. |
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