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CAT5241WI10 Datasheet(PDF) 9 Page - ON Semiconductor |
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CAT5241WI10 Datasheet(HTML) 9 Page - ON Semiconductor |
9 / 16 page CAT5241 © 2009 SCILLC. All rights reserved. 9 Doc. No. MD-2011 Rev. R Characteristics subject to change without notice WIPER CONTROL AND DATA REGISTERS Wiper Control Register (WCR) The CAT5241 contains four 6-bit Wiper Control Registers, one for each potentiometer. The Wiper Control Register output is decoded to select one of 64 switches along its resistor array. The contents of the WCR can be altered in four ways: it may be written by the host via Write Wiper Control Register instruction; it may be written by transferring the contents of one of four associated Data Registers via the XFR Data Register instruction, it can be modified one step at a time by the Increment/decrement instruction (see Instruction section for more details). Finally, it is loaded with the content of its data register zero (DR0) upon power-up. The Wiper Control Register is a volatile register that loses its contents when the CAT5241 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 Regis– ters is a non-volatile operation and will take a maximum of 5ms. If the application does not require storage of multiple settings for the potentiometer, the Data Registers can be used as standard memory locations for system parameters or user preference data. INSTRUCTIONS Four of the nine 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 The basic sequence of the three byte instructions is illustrated in Figure 8. These three-byte instructions Table 3. Instruction Set Instruction Set Instruction I3 I2 I1 I0 WCR1 / P1 WCR0 / P0 R1 R0 Operations Read Wiper Control Register 1 0 0 1 1/0 1/0 0 0 Read the contents of the Wiper Control Register pointed to by P1-P0 Write Wiper Control Register 1 0 1 0 1/0 1/0 0 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 Global XFR Data Registers to Wiper Control Registers 0 0 0 1 0 0 1/0 1/0 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 0 0 1/0 1/0 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 1/0 1/0 0 0 Enable Increment/decrement of the Control Latch pointed to by P1-P0 Note: 1/0 = data is one or zero |
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