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X9448YP24-2.7 Datasheet(PDF) 8 Page - Intersil Corporation |
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X9448YP24-2.7 Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 19 page 8 FN8201.0 April 18, 2005 REGISTERS OPERATION Both XDCP potentiometers and voltage comparators share the serial interface and share a common archi- tecture. Each potentiometer and voltage comparator is associated with wiper counter and analog control reg- isters and eight data registers. A detailed discussion of the register organization and array operation follows. Wiper Counter (WCR) and Analog Control Registers (ACR) The X9448 contains two wiper counter registers one for each XDCP potentiometer and two analog control registers, one for each of the two voltage comparators. The wiper counter register is equivalent to a serial-in, parallel-out counter with its outputs decoded to select one of sixty-four switches along its resistor array. The contents of the wiper counter register and analog con- trol register can be altered in four ways: it may be writ- ten directly by the host via the Write WCR instruction (serial load); it may be written indirectly by transferring the contents of one of four associated data registers (DR) via the XFR data register instruction (parallel load); it can be modified one step at a time by the increment/decrement instruction (WCR only). Finally, it is loaded with the contents of its data register zero (R0) upon power-up. The wiper counter and analog control register are vol- atile registers; that is, their contents are lost when the X9448 is powered-down. Although the registers are automatically loaded with the value in R0 upon power- up, it should be noted this may be different from the value present at power-down. Programming the ACR is similar to the WCR. How- ever, the 6 bits in the WCR positions the wiper in the resistor array while 3 bits in the ACR control the com- parator and its output. Data Registers (DR) Each potentiometer and each voltage comparator has four nonvolatile data registers (DR). These can be read or written directly by the host and data can be transferred between any of the four data registers and the WCR or ACR. It should be noted all operations changing data in one of these registers is a nonvolatile operation and will take a maximum of 10ms. If the application does not require storage of multiple settings for the potentiometer or comparator, these registers can be used as regular memory locations that could store system parameters or user preference data. REGISTER DESCRIPTIONS Wiper Counter Register (WCR) WP0-WP5 identify wiper position. Analog Control Register (ACR) Shutdown “1” indicates power is connected to the voltage comparator. “0” indicates power is not connected to the voltage comparator. Enable “1” indicates the output buffer of the voltage com- parator is enabled. “0” indicates the output buffer of the voltage com- parator is disabled. Latch “1” indicates the output of the voltage comparator is memorized or latched. “0” indicates the output of the voltage comparator is not latched. Userbits—available for user applications Data Registers (DR, R0 - R3) Memory Map 0 0 WP5 WP4 WP3 WP2 WP1 WP0 (volatile) (LSB) 00 User -bit5 User -bit4 User -bit3 Latch Enable Shut- down (volatile) (LSB) Wiper Position or Analog Control Data or User Data (Nonvolatile) WCRO WCR1 ACR0 ACR1 R0 R0 R0 R0 R1 R1 R1 R1 R2 R2 R2 R2 R3 R3 R3 R3 X9448 |
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