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X9429WV14Z Datasheet(PDF) 7 Page - Intersil Corporation |
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X9429WV14Z Datasheet(HTML) 7 Page - Intersil Corporation |
7 / 20 page 7 FN8248.3 October 13, 2008 TABLE 1. INSTRUCTION SET Read Wiper Counter Register (read the current wiper position of the selected pot), write Wiper Counter Register (change current wiper position of the selected pot), read Data Register (read the contents of the selected nonvolatile register) and write Data Register (write a new value to the selected Data Register). The sequence of operations is shown in Figure 4. The Increment/Decrement command is different from the other commands. Once the command is issued and the X9429 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/RH terminal. Similarly, for each SCL clock pulse while SDA is LOW, the selected wiper will move one resistor segment towards the VL/RL terminal. A detailed illustration of the sequence and timing for this operation are shown in Figures 5 and 6 respectively. NOTE: (1)1/0 = data is one or zero INSTRUCTION INSTRUCTION SET OPERATION I3 I2 I1 I0 R1 R0 X1 X0 Read Wiper Counter Register 1 0 0 1 0 0 0 0 Read the contents of the Wiper Counter Register Write Wiper Counter Register 1 0 1 0 0 0 0 0 Write new value to the Wiper Counter Register Read Data Register 1 0 1 1 1/0 1/0 0 0 Read the contents of the Data Register pointed to by R1 - R0 Write Data Register 1 1 0 0 1/0 1/0 0 0 Write new value to the Data Register pointed to by R1 - R0 XFR Data Register to Wiper Counter Register 1 1 0 1 1/0 1/0 0 0 Transfer the contents of the Data Register pointed to by R1 - R0 to its Wiper Counter Register XFR Wiper Counter Register to Data Register 1 1 1 0 1/0 1/0 0 0 Transfer the contents of the Wiper Counter Register to the Data Register pointed to by R1 - R0 Increment/Decrement Wiper Counter Register 0 0 1 0 0 0 0 0 Enable Increment/decrement of the Wiper Counter Register S T A R T 0 1 0 1 A3 A2 0 A0 A C K I3 I2 I1 I0 R1 R0 0 0 A C K SCL SDA S T O P A C K 0 0 D5 D4 D3 D2 D1 D0 FIGURE 4. THREE-BYTE INSTRUCTION SEQUENCE S T A R T 01 01 A3 A2 0A0 A C K I3 I2 I1 I0 R0 0 0 A C K SCL SDA S T O P I N C 1 I N C 2 I N C n D E C 1 D E C n R1 FIGURE 5. INCREMENT/DECREMENT INSTRUCTION SEQUENCE X9429 |
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