MCP433X datasheet(41/88 Pages) MICROCHIP

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 2010 Microchip Technology Inc.

DS22242A-page 41

MCP433X/435X

4.2.1.1

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.

while Register 4-2 describes each bit of the TCON1

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.

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.

TCON0 BITS (1)

R-1

R/W-1

R1HW

R1A

R1W

R1B

R0HW

R0A

R0W

R0B

bit 8

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 8

D8: Reserved. Forced to “1”

bit 7

R1HW: Resistor 1 Hardware Configuration Control bit

This bit forces Resistor 1 into the “shutdown” configuration of the Hardware pin

1 = Resistor 1 is NOT forced to the hardware pin “shutdown” configuration

0 = Resistor 1 is forced to the hardware pin “shutdown” configuration

bit 6

R1A: Resistor 1 Terminal A (P1A pin) Connect Control bit

This bit connects/disconnects the Resistor 1 Terminal A to the Resistor 1 Network

1 = P1A pin is connected to the Resistor 1 Network

0 = P1A pin is disconnected from the Resistor 1 Network

bit 5

R1W: Resistor 1 Wiper (P1W pin) Connect Control bit

This bit connects/disconnects the Resistor 1 Wiper to the Resistor 1 Network

1 = P1W pin is connected to the Resistor 1 Network

0 = P1W pin is disconnected from the Resistor 1 Network

bit 4

R1B: Resistor 1 Terminal B (P1B pin) Connect Control bit

This bit connects/disconnects the Resistor 1 Terminal B to the Resistor 1 Network

1 = P1B pin is connected to the Resistor 1 Network

0 = P1B pin is disconnected from the Resistor 1 Network

bit 3

R0HW: Resistor 0 Hardware Configuration Control bit

This bit forces Resistor 0 into the “shutdown” configuration of the Hardware pin

1 = Resistor 0 is NOT forced to the hardware pin “shutdown” configuration

0 = Resistor 0 is forced to the hardware pin “shutdown” configuration

bit 2

R0A: Resistor 0 Terminal A (P0A pin) Connect Control bit

This bit connects/disconnects the Resistor 0 Terminal A to the Resistor 0 Network

1 = P0A pin is connected to the Resistor 0 Network

0 = P0A pin is disconnected from the Resistor 0 Network

bit 1

R0W: Resistor 0 Wiper (P0W pin) Connect Control bit

This bit connects/disconnects the Resistor 0 Wiper to the Resistor 0 Network

1 = P0W pin is connected to the Resistor 0 Network

0 = P0W pin is disconnected from the Resistor 0 Network

bit 0

R0B: Resistor 0 Terminal B (P0B pin) Connect Control bit

This bit connects/disconnects the Resistor 0 Terminal B to the Resistor 0 Network

1 = P0B pin is connected to the Resistor 0 Network

0 = P0B pin is disconnected from the Resistor 0 Network

Note 1:

These bits do not affect the wiper register values.

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