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X9258UV24IZ Datasheet(PDF) 6 Page - Intersil Corporation |
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X9258UV24IZ Datasheet(HTML) 6 Page - Intersil Corporation |
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6 / 19 page  6 FN8168.6 December 15, 2011 The Increment/Decrement command is different from the other commands. Once the command is issued and the X9258 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/RL terminal. A detailed illustration of the sequence and timing for this operation are shown in Figures 5 and 6 respectively. TABLE 1. INSTRUCTION SET INSTRUCTION INSTRUCTION SET OPERATION I3 I2 I1 I0 R1 R0 P1 P0 Read Wiper Counter Register 1 0 0 1 0 0 1/0 1/0 Read the contents of the Wiper Counter Register pointed to by P1 - P0 Write Wiper Counter Register 1 0 1 0 0 0 1/0 1/0 Write new value to the Wiper Counter Register pointed to by P1 - P0 Read Data Register 1 0 1 1 1/0 1/0 1/0 1/0 Read the contents of the Data Register pointed to by P1 - P0 and R1 - R0 Write Data Register 1 1 0 0 1/0 1/0 1/0 1/0 Write new value to the Data Register pointed to by P1 - P0 and R1 - R0 XFR Data Register to Wiper Counter Register 1 1 0 1 1/0 1/0 1/0 1/0 Transfer the contents of the Data Register pointed to by P1 -P0 and R1 - R0 to its associated Wiper Counter Register XFR Wiper Counter Register to Data Register 1 1 1 0 1/0 1/0 1/0 1/0 Transfer the contents of the Wiper Counter Register pointed to by P1 - P0 to the Data Register pointed to by R1 - R0 Global XFR Data Registers to Wiper Counter Registers 0 0 0 1 1/0 1/0 0 0 Transfer the contents of the Data Registers pointed to by R1 - R0 of all four potentiometers to their respective Wiper Counter Registers Global XFR Wiper Counter Registers to Data Register 1 0 0 0 1/0 1/0 0 0 Transfer the contents of both Wiper Counter Registers to their respective data Registers pointed to by R1 - R0 of all four potentiometers Increment/Decrement Wiper Counter Register 0 0 1 0 0 0 1/0 1/0 Enable Increment/decrement of the Control Latch pointed to by P1 - P0 NOTE: 4. 1/0 = data is one or zero. X9258 |
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