전자부품 데이터시트 검색엔진 |
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X9221 데이터시트(PDF) 4 Page - Xicor Inc. |
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X9221 데이터시트(HTML) 4 Page - Xicor Inc. |
4 / 14 page 4 X9221 Instruction Structure The next byte sent to the X9221 contains the instruction and register pointer information. The four most signifi- cant bits are the instruction. The next four bits point to one of two pots and when applicable they point to one of four associated registers. The format is shown below in Figure 2. current wiper position to a data register is a write to nonvolatile memory and takes a minimum of tWR to complete. The transfer can occur between either poten- tiometer and their associated registers or it may occur between both of the potentiometers and one of their associated registers. Four instructions require a three-byte sequence to complete. These instructions transfer data between the host and the X9221; either between the host and one of the data registers or directly between the host and the WCR. These instructions are: Read WCR, read the current wiper position of the selected pot; Write WCR, change current wiper position of the selected pot; Read Data Register, read the contents of the selected non- volatile register; Write Data Register, write a new value to the selected data register. The sequence of opera- tions is shown in Figure 4. The Increment/Decrement command is different from the other commands. Once the command is issued and the X9221 has responded with an acknowledge, the master can clock the selected wiper up and/or down in one segment steps; thereby, providing a fine tuning capability to the host. For each SCL clock pulse (tHIGH) while SDA is HIGH, the selected wiper will move one resistor segment towards the VH terminal. Similarly, for each SCL clock pulse while SDA is LOW, the selected wiper will move one resistor segment towards the VL terminal. A detailed illustration of the sequence and timing for this operation are shown in Figures 5 and 6 respectively. Figure 2. Instruction Byte Format The four high order bits define the instruction. The sixth bit (P0) selects which one of the two potentiometers is to be affected by the instruction. The last two bits (R1 and R0) select one of the four registers that is to be acted upon when a register oriented instruction is issued. Four of the nine 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 WCR and one of the data registers. A transfer from a data register to a WCR is essentially a write to a static RAM. The response of the wiper to this action will be delayed tSTPWV. A transfer from WCR’s Figure 3. Two-Byte Command Sequence I1 I2 I3 I0 0 P0 R1 R0 POTENTIOMETER SELECT REGISTER SELECT INSTRUCTIONS 3079 ILL F09.1 S T A R T 0101 A3 A2 A1 A0 A C K I3 I2 I1 I0 0 P0 R1 R0 A C K SCL SDA S T O P 3079 ILL F10 |
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