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X9268TS24IZ-2.7 Datasheet(PDF) 8 Page - Intersil Corporation |
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X9268TS24IZ-2.7 Datasheet(HTML) 8 Page - Intersil Corporation |
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8 / 22 page  8 FN8172.4 August 29, 2006 Acknowledge Polling The disabling of the inputs, during the internal nonvolatile write operation, can be used to take advantage of the typical 5ms nonvolatile write cycle time. Once the stop condition is issued to indicate the end of the nonvolatile write command the X9268 initiates the internal write cycle. ACK polling, Flow 1, can be initiated immediately. This involves issuing the start condition followed by the device slave address. If the X9268 is still busy with the write operation no ACK will be returned. If the X9268 has completed the write operation an ACK will be returned and the master can then proceed with the next operation. FLOW 1: ACK Polling Sequence INSTRUCTION AND REGISTER DESCRIPTION Instructions DEVICE ADDRESSING: IDENTIFICATION BYTE (ID AND A) The first byte sent to the X9268 from the host is called the Identification Byte. The most significant four bits of the slave address are a device type identifier. The ID[3:0] bits is the device id for the X9268; this is fixed as 0101[B] (refer to Table 1). The A[3:0] bits in the ID byte is the internal slave address. The physical device address is defined by the state of the A3 - A0 input pins. The slave address is externally specified by the user. The X9268 compares the serial data stream with the address input state; a successful compare of both address bits is required for the X9268 to successfully continue the command sequence. Only the device which slave address matches the incoming device address sent by the master executes the instruction. The A3 - A0 inputs can be actively driven by CMOS input signals or tied to VCC or VSS. INSTRUCTION BYTE (I) The next byte sent to the X9268 contains the instruction and register pointer information. The three most significant bits are used provide the instruction opcode I [3:0]. The RB and RA bits point to one of the four Data Registers of each associated XDCP. The least significant bit points to one of two Wiper Counter Registers or Pots. The format is shown in Table 2. Register Selection Nonvolatile Write Command Completed EnterACK Polling Issue START Issue Slave Address ACK Returned? Further Operation? Issue Instruction Issue STOP No Yes Yes Proceed Issue STOP No Proceed Register Selected RB RA DR0 0 0 DR1 0 1 DR2 1 0 DR3 1 1 X9268 |
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