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X9408YV24I Datasheet(PDF) 6 Page - Intersil Corporation |
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X9408YV24I Datasheet(HTML) 6 Page - Intersil Corporation |
6 / 20 page 6 FN8191.4 January 15, 2009 The Increment/Decrement command is different from the other commands. Once the command is issued and the X9408 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 RH terminal. Similarly, for each SCL clock pulse while SDA is LOW, the selected wiper will move one resistor segment towards the 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 NOTE: (7)1/0 = data is one or zero INSTRUCTION INSTRUCTION SET OPERATION I3 I2 I1 I0 R1 R0 P1 P0 Read Wiper CounterRegister 1 0 0 1 0 0 P1 P0 Read the contents of the Wiper Counter Register pointed to by P1 - P0 Write Wiper CounterRegister 1 0 1 0 0 0 P1 P0 Write new value to the Wiper Counter Register pointed to by P1 - P0 Read Data Register 1 0 1 1 R1 R0 P1 P0 Read the contents of the Data Register pointed to by P1 - P0 and R1 - R0 Write Data Register 1 1 0 0 R1 R0 P1 P0 Write new value to the Data Register pointed to by P1 - P0 and R1 - R0 XFR Data Register to Wiper Counter Register 11 0 1 R1 R0 P1 P0 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 11 1 0 R1 R0 P1 P0 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 00 0 1 R1 R0 0 0 Transfer the contents of the Data Registers pointed to by R1 - R0 of all four pots to their respective Wiper Counter Registers Global XFR Wiper Counter Registers to Data Register 10 0 0 R1 R0 0 0 Transfer the contents of both Wiper Counter Registers to their respective Data Registers pointed to by R1 - R0 of all four pots Increment/Decrement Wiper Counter Register 00 1 0 0 0 P1 P0 Enable Increment/decrement of the Wiper Counter Register pointed to by P1 - P0 S T A R T 0 1 0 1 A3 A2 A1 A0 A C K I3 I2 I1 I0 R1 R0 P1 P0 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 0 1 0 1 A3 A2 A1 A0 A C K I3 I2 I1 I0 R0 P1 P0 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 X9408 |
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