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X9429 Datasheet(PDF) 6 Page - Intersil Corporation |
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X9429 Datasheet(HTML) 6 Page - Intersil Corporation |
6 / 21 page 6 FN8248.2 October 19, 2005 Acknowledge Polling The disabling of the inputs, during the internal nonvolatile write operation, can be used to take advantage of the typical 5ms EEPROM write cycle time. Once the stop condition is issued to indicate the end of the nonvolatile write command the X9429 initiates the internal write cycle. ACK polling can be initiated immediately. This involves issuing the start condition followed by the device slave address. If the X9429 is still busy with the write operation no ACK will be returned. If the X9429 has completed the write operation an ACK will be returned, and the master can then proceed with the next operation. Instruction Structure The next byte sent to the X9429 contains the instruction and register pointer information. The four most significant bits are the instruction. The next four bits point to one of four associated registers. The format is shown below in Figure 2. Figure 2. Instruction Byte Format Flow 1. ACK Polling Sequence The four high order bits define the instruction. The next two bits (R1 and R0) select one of the four registers that is to be acted upon when a register oriented instruction is issued. Bits 0 and 1 are defined to be 0. Four of the seven instructions end with the transmission of the instruction byte. The basic sequence is illustrated in Figure 3. These two-byte instructions exchange data between the Wiper Counter Register and one of the Data Registers. A transfer from a Data Register to a Wiper Counter Register is essentially a write to a static RAM. The response of the wiper to this action will be delayed tWRL. A transfer from the Wiper Counter Register (current wiper position), to a Data Register is a write to nonvolatile memory and takes a minimum of tWR to complete. Four instructions require a three-byte sequence to complete. These instructions transfer data between the host and the X9429; either between the host and one of the Data Registers or directly between the host and the Wiper Counter Register. These instructions are: I1 I2 I3 I0 R1 R0 0 0 Register Select Instructions Nonvolatile Write Command Completed Enter ACK Polling Issue START Issue Slave Address ACK Returned? Further Operation? Issue Instruction Issue STOP NO YES YES Proceed Issue STOP NO Proceed X9429 |
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