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X40626S14I-2.7 Datasheet(PDF) 7 Page - Intersil Corporation |
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X40626S14I-2.7 Datasheet(HTML) 7 Page - Intersil Corporation |
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7 / 22 page  7 FN8119.0 March 28, 2005 Table 1. Write Protect Enable Bit and WP Pin Function Writing to the Control Register Changing any of the nonvolatile bits of the control reg- ister requires the following steps: – Write a 02H to the Control Register to set the Write Enable Latch (WEL). This is a volatile operation, so there is no delay after the write. (Operation pro- ceeded by a start and ended with a stop). – Write a 06H to the Control Register to set both the Register Write Enable Latch (RWEL) and the WEL bit. This is also a volatile cycle. The zeros in the data byte are required. (Operation proceeded by a start and ended with a stop). – Write a value to the Control Register that has all the control bits set to the desired state. This can be rep- resented as 0xys t01r in binary, where xy are the WD bits, and rst are the BP bits. (Operation pre- ceeded by a start and ended with a stop). Since this is a nonvolatile write cycle it will take up to 10ms to complete. The RWEL bit is reset by this cycle and the sequence must be repeated to change the non- volatile bits again. If bit 2 is set to ‘1’ in this third step (0xys t11r) then the RWEL bit is set, but the WD1, WD0, BP2, BP1 and BP0 bits remain unchanged. Writing a second byte to the control register is not allowed. Doing so aborts the write operation and returns a NACK. – A read operation occurring between any of the previ- ous operations will not interrupt the register write operation. – The RWEL bit cannot be reset without writing to the nonvolatile control bits in the control register, power cycling the device or attempting a write to a write protected block. To illustrate, a sequence of writes to the device con- sisting of [02H, 06H, 02H] will reset all of the nonvola- tile bits in the Control Register to 0. A sequence of [02H, 06H, 06H] will leave the nonvolatile bits unchanged and the RWEL bit remains set. SERIAL INTERFACE Serial Interface Conventions The device supports a bidirectional bus oriented proto- col. The protocol defines any device that sends data onto the bus as a transmitter, and the receiving device as the receiver. The device controlling the transfer is called the master and the device being controlled is called the slave. The master always initiates data transfers, and provides the clock for both transmit and receive operations. Therefore, the devices in this fam- ily operate as slaves in all applications. Serial Clock and Data Data states on the SDA line can change only during SCL LOW. SDA state changes during SCL HIGH are reserved for indicating start and stop conditions. See Figure 5. WP WPEN Memory Array not Block Protected Memory Array Block Protected Block Protect Bits WPEN Bit Protection LOW X Writes OK Writes Blocked Writes OK Writes OK Software HIGH 0 Writes OK Writes Blocked Writes OK Writes OK Software HIGH 1 Writes OK Writes Blocked Writes Blocked Writes Blocked Hardware X40626 |
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