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CAT5409WI25 Datasheet(PDF) 10 Page - ON Semiconductor |
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CAT5409WI25 Datasheet(HTML) 10 Page - ON Semiconductor |
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10 / 15 page  CAT5409 http://onsemi.com 10 Read Data Register – read the contents of the selected Data Register Write Data Register – write a new value to the selected Data Register Table 12. INSTRUCTION SET (Note: 1/0 = data is one or zero) Instruction Instruction Set Operation I3 I2 I1 I0 R1 R0 WCR1/ P1 WCR0/ P0 Read Wiper Control Register 1 0 0 1 0 0 1/0 1/0 Read the contents of the Wiper Control Register pointed to by P1−P0 Write Wiper Control Register 1 0 1 0 0 0 1/0 1/0 Write new value to the Wiper Control 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 Control 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 Control Register XFR Wiper Control Register to Data Register 1 1 1 0 1/0 1/0 1/0 1/0 Transfer the contents of the Wiper Control Register pointed to by P1−P0 to the Data Register pointed to by R1−R0 Gang XFR Data Registers to Wiper Control 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 pots to their respective Wiper Control Registers Gang XFR Wiper Control Registers to Data Register 1 0 0 0 1/0 1/0 0 0 Transfer the contents of both Wiper Control Registers to their respective data Registers pointed to by R1−R0 of all four pots Increment/ Decrement Wiper Control Register 0 0 1 0 0 0 1/0 1/0 Enable Increment/decrement of the Control Latch pointed to by P1−P0 The basic sequence of the three byte instructions is illustrated in Figure 11. These three-byte instructions exchange data between the WCR and one of the Data Registers. The WCR controls the position of the wiper. The response of the wiper to this action will be 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 potentiometers and one of its associated registers; or the transfer can occur between all potentiometers and one associated register. Four instructions require a two-byte sequence to complete, as illustrated in Figure 10. These instructions transfer data between the host/processor and the CAT5409; either between the host and one of the data registers or directly between the host and the Wiper Control Register. These instructions are: XFR Data Register to Wiper Control Register This transfers the contents of one specified Data Register to the associated Wiper Control Register. XFR Wiper Control Register to Data Register This transfers the contents of the specified Wiper Control Register to the specified associated Data Register. Global XFR Data Register to Wiper Control Register This transfers the contents of all specified Data Registers to the associated Wiper Control Registers. Global XFR Wiper Counter Register to Data Register This transfers the contents of all Wiper Control Registers to the specified associated Data Registers. Increment/Decrement Command The final command is Increment/Decrement (Figures 6 and 12). The Increment/Decrement command is different from the other commands. Once the command is issued and the CAT5409 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. See Instructions format for more detail. |
Número de pieza similar - CAT5409WI25 |
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Descripción similar - CAT5409WI25 |
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