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CAT5259YI-50TE13 Datasheet(PDF) 9 Page - Catalyst Semiconductor |
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CAT5259YI-50TE13 Datasheet(HTML) 9 Page - Catalyst Semiconductor |
9 / 16 page 9 CAT5259 Document No. 2000, Rev. F Table 3. Instruction Set WIPER CONTROL AND DATA REGISTERS Wiper Control Register (WCR) The CAT5259 contains four 8-bit Wiper Control Registers, one for each potentiometer. The Wiper Control Register output is decoded to select one of 256 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 CAT5259 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 8-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 10ms. 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 Note: 1/0 = data is one or zero Instruction Instruction Set Operation I3 I2 I1 I0 R1 R0 WCR1/ P1 Read Wiper Control Register 1001 0 0 1/0 1/0 Read the contents of the Wiper Control Register pointed to by P1-P0 Write Wiper Control Register 1010 0 0 1/0 1/0 Write new value to the Wiper Control Register pointed to by P1-P0 Read Data Register 1011 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 1100 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 1101 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 1110 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 0001 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 1000 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 0010 0 0 1/0 1/0 Enable Increment/decrement of the Control Latch pointed to by P1-P0 WCR0/ P0 |
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