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X9259UV24-2.7 Datasheet(PDF) 9 Page - Intersil Corporation |
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X9259UV24-2.7 Datasheet(HTML) 9 Page - Intersil Corporation |
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9 / 21 page  9 FN8169.5 April 13, 2007 Instructions Four of the nine instructions are three bytes in length. These instructions are: • Read Wiper Counter Register – read the current wiper position of the selected potentiometer, • Write Wiper Counter Register – change current wiper position of the selected potentiometer, • Read Data Register – read the contents of the selected Data Register; • Write Data Register – write a new value to the selected Data Register. The basic sequence of the three byte instructions is illustrated in Figure 5. These three-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, with the static RAM controlling the wiper position. The response of the wiper to this action is delayed by tWRL. A transfer from the WCR (current wiper position), to a Data Register is a write to non- volatile memory and takes a minimum of tWR to complete. The transfer can occur between one of the four potentiometer’s WCR, and one of its associated registers, DRs; or it may occur globally, where the transfer occurs between all potentiometers and one associated register. Four instructions require a two-byte sequence to complete. These instructions transfer data between the host and the X9259; either between the host and one of the data registers or directly between the host and the Wiper Counter Register. These instructions are: • XFR Data Register to Wiper Counter Register – This transfers the contents of one specified Data Register to the associated Wiper Counter Register. • XFR Wiper Counter Register to Data Register – This transfers the contents of the specified Wiper Counter Register to the specified associated Data Register. • Global XFR Data Register to Wiper Counter Register – This transfers the contents of all specified Data Registers to the associated Wiper Counter Registers. • Global XFR Wiper Counter Register to Data Register – This transfers the contents of all Wiper Counter Registers to the specified associated Data Registers. Increment/Decrement Command The final command is Increment/Decrement (Figure 6 and 7). The Increment/Decrement command is different from the other commands. Once the command is issued and the X9259 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 moves one wiper position towards the RH terminal. Similarly, for each SCL clock pulse while SDA is LOW, the selected wiper moves one resistor wiper position towards the RL terminal. See Instruction format for more details. S T A R T 01 0 1 A2 A0 A C K I2 I1 I0 RB RA P1 A C K SCL SDA S T O P ID3 ID2 ID1 ID0 P0 Device ID External Instruction Opcode Address Register Address DCP/WCR Address A1 A3 I3 FIGURE 4. TWO-BYTE INSTRUCTION SEQUENCE I3 I2 I1 I0 RB RA ID3 ID2 ID1ID0 Device ID External Instruction Opcode Address Register Address Pot/WCR Address Data for WCR[7:0] or DR[7:0] S T A R T 01 0 1 A2 A1 A0 A C K P1 P0 A C K SCL SDA S T O P A C K D7 D6 D5 D4 D3 D2 D1 D0 A3 FIGURE 5. THREE-BYTE INSTRUCTION SEQUENCE 2-WIRE INTERFACE X9259 |
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