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MCP4341T503E/ST 数据表(PDF) 36 Page - Microchip Technology |
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MCP4341T503E/ST 数据表(HTML) 36 Page - Microchip Technology |
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36 / 80 page  MCP434X/436X DS22233A-page 36 © 2009 Microchip Technology Inc. 4.2.2.2 Terminal Control (TCON) Registers There are two Terminal Control (TCON) Registers. These are called TCON0 and TCON1. Each register contains 8 control bits. Four bits for each Wiper. Register 4-2 describes each bit of the TCON0 register, while Register 4-3 describes each bit of the TCON1 register. The state of each resistor network terminal connection is individually controlled. That is, each terminal connection (A, B and W) can be individually connected/ disconnected from the resistor network. This allows the system to minimize the currents through the digital potentiometer. The value that is written to the specified TCON register will appear on the appropriate resistor network terminals when the serial command has completed. When the WL1 bit is enabled, writes to the TCON0 register bits R1HW, R1A, R1W, and R1B are inhibited. When the WL0 bit is enabled, writes to the TCON0 register bits R0HW, R0A, R0W, and R0B are inhibited. When the WL3 bit is enabled, writes to the TCON1 register bits R3HW, R3A, R3W, and R3B are inhibited. When the WL2 bit is enabled, writes to the TCON1 register bits R2HW, R2A, R2W, and R2B are inhibited. On a POR/BOR these registers are loaded with 1FFh (9-bits), for all terminals connected. The Host Controller needs to detect the POR/BOR event and then update the Volatile TCON register values. |
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