MCP4441 datasheet(44/100 Pages) MICROCHIP

44 / 100 page

MCP444X/446X

DS22265A-page 44

4.2.2.1

Status (STATUS) Register

This register contains 7 status bits. These bits show the

state of the WiperLock bits, the Write Protect bit, and if

an EEPROM write cycle is active. The STATUS register

can be accessed via the READ commands. Register 4-

1 describes each STATUS register bit.

The STATUS register is placed at Address 05h.

STATUS REGISTER

R-1

R-0

R-x

R-1

R-x

D8:D7

WL3 (1)

WL2 (1)

EEWA

WL1 (1)

WL0 (1)

—WP (1)

bit 7

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 8-7

D8:D7:

Reserved. Forced to “1”

bit 6

WL3:

WiperLock Status bit for Resistor Network 3 (Refer to Section 5.3 “WiperLock Technology” for

further information)

The WiperLock Technology bit (WL3) prevents the Volatile and Nonvolatile Wiper 3 addresses and the

TCON1 register bits R3HW, R3A, R3W, and R3B from being written to. High Voltage commands are

required to enable and disable WiperLock Technology.

= Wiper and TCON1 register bits R3HW, R3A, R3W, and R3B of Resistor Network 3 (Pot 3) are

“Locked” (Write Protected)

= Wiper and TCON1 of Resistor Network 3 (Pot 3) can be modified

Note:

The WL3 bit always reflects the result of the last programming cycle to the nonvolatile WL3

bit. After a POR/BOR or RESET pin event, the WL3 bit is loaded with the nonvolatile WL3 bit

value.

bit 5

WL2:

WiperLock Status bit for Resistor Network 2 (Refer to Section 5.3 “WiperLock Technology” for

further information)

The WiperLock Technology bit (WL2) prevents the Volatile and Nonvolatile Wiper 2 addresses and the

TCON1 register bits R2HW, R2A, R2W, and R2B from being written to. High Voltage commands are

required to enable and disable WiperLock Technology.

= Wiper and TCON1 register bits R2HW, R2A, R2W, and R2B of Resistor Network 2 (Pot 2) are

“Locked” (Write Protected)

= Wiper and TCON1 of Resistor Network 2 (Pot 2) can be modified

Note:

The WL0 bit always reflects the result of the last programming cycle to the nonvolatile WL0

bit. After a POR/BOR or RESET pin event, the WL0 bit is loaded with the nonvolatile WL0 bit

value.

bit 4

EEWA:

EEPROM Write Active Status bit

This bit indicates if the EEPROM Write Cycle is occurring.

= An EEPROM Write cycle is currently occurring. Only serial commands to the Volatile memory

locations are allowed (addresses 00h, 01h, 04h, and 05h)

= An EEPROM Write cycle is NOT currently occurring

Note 1:

Requires a High Voltage command to modify the state of this bit (for Nonvolatile devices only). This bit is

not directly written, but reflects the system state (for this feature).

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