MCP4531 datasheet(39/102 Pages) MICROCHIP

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 2008-2013 Microchip Technology Inc.

DS22107B-page 39

MCP454X/456X/464X/466X

4.2.2.1

Status (STATUS) Register

This register contains four 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

The STATUS register is placed at Address 05h.

STATUS REGISTER (ADDRESS = 0x05)

R-1

R-0

R-x

D8:D4

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 8-4

D8:D4: Reserved. Forced to “1”

bit 3

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

bit 2

WL1: WiperLock Status bit for Resistor Network 1 (Refer to Section 5.3 “WiperLock™ Technology”

for further information)

WiperLock (WL) prevents the Volatile and Nonvolatile Wiper 1 addresses and the TCON register bits

R1HW, R1A, R1W, and R1B from being written to. High Voltage commands are required to enable and

disable WiperLock Technology.

Wiper and TCON register bits R1HW, R1A, R1W, and R1B of Resistor Network 1 (Pot 1) are

“Locked” (Write Protected)

Wiper and TCON of Resistor Network 1 (Pot 1) can be modified

Note:

The WL1 bit always reflects the result of the last programming cycle to the nonvolatile WL1

bit. After a POR or BOR event, the WL1 bit is loaded with the nonvolatile WL1 bit value.

bit 1

WL0: WiperLock Status bit for Resistor Network 0 (Refer to Section 5.3 “WiperLock™ Technology”

for further information)

The WiperLock Technology bits (WLx) prevents the Volatile and Nonvolatile Wiper 0 addresses and the

TCON register bits R0HW, R0A, R0W, and R0B from being written to. High Voltage commands are

required to enable and disable WiperLock Technology.

Wiper and TCON register bits R0HW, R0A, R0W, and R0B of Resistor Network 0 (Pot 0) are

“Locked” (Write Protected)

Wiper and TCON of Resistor Network 0 (Pot 0) can be modified

Note:

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

bit. After a POR or BOR event, the WL0 bit is loaded with the nonvolatile WL0 bit value.

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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