MCP4531 Microchip Technology Inc., MCP4531 Datasheet - Page 39

• Manufacturer Part Number: MCP4531
• Description: 7/8-bit Single/dual I 2 C Digital Pot With Non-volatile Memory
• Manufacturer: Microchip Technology Inc.

4.2.2.1
This register contains 4 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
Register 4-1
The STATUS register is placed at Address 05h.
REGISTER 4-1:
© 2008 Microchip Technology Inc.
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 8-4
bit 3
bit 2
bit 1
Note 1:
R-1
be
accessed
Requires a High Voltage command to modify the state of this bit (for Non-Volatile devices only). This bit is
Not directly written, but reflects the system state (for this feature).
describes each STATUS register bit.
Status (STATUS) Register
D8:D4: Reserved. Forced to “1”
EEWA: EEPROM Write Active Status bit
This bit indicates if the EEPROM Write Cycle is occurring.
1 = An EEPROM Write cycle is currently occurring. Only serial commands to the Volatile memory
0 = An EEPROM Write cycle is NOT currently occurring
WL1: WiperLock Status bit for Resistor Network 1 (Refer to Section 5.3 “WiperLock™ Technology”
for further information)
WiperLock (WL) prevents the Volatile and Non-Volatile 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.
1 = Wiper and TCON register bits R1HW, R1A, R1W, and R1B of Resistor Network 1 (Pot 1) are
0 = Wiper and TCON of Resistor Network 1 (Pot 1) can be modified
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 Non-Volatile 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.
1 = Wiper and TCON register bits R0HW, R0A, R0W, and R0B of Resistor Network 0 (Pot 0) are
0 = Wiper and TCON of Resistor Network 0 (Pot 0) can be modified
Note:
Note:
R-1
locations are allowed (addresses 00h, 01h, 04h, and 05h)
“Locked” (Write Protected)
“Locked” (Write Protected)
STATUS REGISTER (ADDRESS = 0x05)
via
The WL1 bit always reflects the result of the last programming cycle to the non-volatile WL1
bit. After a POR or BOR event, the WL1 bit is loaded with the non-volatile WL1 bit value.
The WL0 bit always reflects the result of the last programming cycle to the non-volatile WL0
bit. After a POR or BOR event, the WL0 bit is loaded with the non-volatile WL0 bit value.
W = Writable bit
‘1’ = Bit is set
the
D8:D4
R-1
READ
commands.
R-1
MCP454X/456X/464X/466X
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
R-1
EEWA
R-0
x = Bit is unknown
WL1
R-x
(1)
WL0
R-x
DS22107A-page 39
(1)
WP
R-x
(1)
bit 0