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X9279TV14I Datasheet(PDF) 10 Page - Xicor Inc. |
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X9279TV14I Datasheet(HTML) 10 Page - Xicor Inc. |
10 / 24 page X9279 Characteristics subject to change without notice. 10 of 24 REV 1.1.7 2/6/03 www.xicor.com Table 4. Wiper counter Register, WCR (8-bit), WCR[7:0]: Used to store the current wiper position (Volatile, V). Table 5. Data Register, DR (8-bit), Bit [7:0]: Used to store wiper positions or data (Nonvolatile, NV). WCR7 WCR6 WCR5 WCR4 WCR3 WCR2 WCR1 WCR0 VVVVVVVV (MSB) (LSB) Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 NV NV NV NV NV NV NV NV MSB LSB Instructions Four of the seven instructions are three bytes in length. These instructions are: – Read Wiper Counter Register – read the current wiper position of the potentiometer, – Write Wiper Counter Register – change current wiper position of the 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 4. These three-byte instructions exchange data between the WCR and one of the Data Registers. A transfer from a Data Register to a WCR is essentially a write to a static RAM, with the static RAM controlling the wiper position. 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 nonvolatile memory and takes a minimum of tWR to complete. The transfer can occur between the potentiometer and one of its four associated registers (Bank 0). Two instructions require a two-byte sequence to complete. These instructions transfer data between the host and the X9279; either between the host and one of the data registers or directly between the host and the Wiper Counter Register. These instructions are: – XFR Data Register to Wiper Counter Register – This transfers the contents of one specified Data Register to the Wiper Counter Register. – XFR Wiper Counter Register to Data Register – This transfers the contents of the Wiper Counter Register to the specified Data Register. The final command is Increment/Decrement (Figure 5 and 6). The Increment/Decrement command is different from the other commands. Once the command is issued and the X9279 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 Instruction format for more details. Figure 3. Two-Byte Instruction Sequence These commands only valid when P1=P0=0 S T A R T 0 101 0 A2 A0 A C K I3 I2 I1 I0 RB RA P1 A C K SCL SDA S T O P 00 ID3 ID2 ID1 ID0 P0 Device ID Internal Instruction Opcode Address Register Address Pot/Bank Address A1 |
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