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CAT5411YI-00-T2 Datasheet(PDF) 9 Page - ON Semiconductor |
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CAT5411YI-00-T2 Datasheet(HTML) 9 Page - ON Semiconductor |
9 / 14 page CAT5411 http://onsemi.com 9 The Wiper Control Register is a volatile register that loses its contents when the CAT5411 is powered-down. Although the register is automatically loaded with the value in DR0 upon power-up, this may be different from the value present at power-down. Data Registers (DR) Each potentiometer has four 6-bit non-volatile Data Registers. These can be read or written directly by the host. Data can also be transferred between any of the four Data Registers and the associated Wiper Control Register. Any data changes in one of the Data Registers is a non-volatile operation and will take a maximum of 5 ms. Write in Process The contents of the Data Registers are saved to nonvolatile memory when the CS input goes HIGH after a write sequence is received. The status of the internal write cycle can be monitored by issuing a Read Status command to read the Write in Process (WIP) bit. INSTRUCTIONS Four of the ten instructions are three bytes in length. These instructions are: Read Wiper Control Register – read the current wiper position of the selected potentiometer in the WCR Write Wiper Control Register – change current wiper position in the WCR 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 Read Status – Read the status of the WIP bit which when set to “1” signifies a write cycle is in progress. Table 12. INSTRUCTION SET (Note: 1/0 = data is one or zero) Instruction Instruction Set Operations I3 I2 I1 I0 R1 R0 0 WCR0/ P0 Read Wiper Control Register 1 0 0 1 0 0 0 1/0 Read the contents of the Wiper Control Register pointed to by P0 Write Wiper Control Register 1 0 1 0 0 0 0 1/0 Write new value to the Wiper Control Register pointed to by P0 Read Data Register 1 0 1 1 1/0 1/0 0 1/0 Read the contents of the Data Register pointed to by P0 and R1−R0 Write Data Register 1 1 0 0 1/0 1/0 0 1/0 Write new value to the Data Register pointed to by P0 and R1−R0 XFR Data Register to Wiper Control Register 1 1 0 1 1/0 1/0 0 1/0 Transfer the contents of the Data Register pointed to by 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 0 1/0 Transfer the contents of the Wiper Control Register pointed to by P0 to the Data Register pointed to by R1−R0 Global 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 Global 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 0 1/0 Enable Increment/decrement of the Control Latch pointed to by P0 Read Status 0 1 0 1 0 0 0 1 Read WIP bit to check internal write cycle status The basic sequence of the three byte instructions is illustrated in Figure 8. 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 7. These instructions transfer data between the host/processor and the CAT5411; either between the host and one of the data registers or directly between the host and the Wiper Control Register. These instructions are: |
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Descripción similar - CAT5411YI-00-T2 |
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