Datasheet

© 2009 Microchip Technology Inc. DS22233A-page 51
MCP434X/436X
TABLE 7-3: COMMANDS
Command Name
# of
Bits
Writes
Value in
EEPROM
Operates on
Volatile/
Non-Volatile
memory
High
Voltage
(V
IHH
) on
CS pin?
Impact on
WiperLock or
Write Protect
Works
when
Wiper is
“locked”?
Write Data 16-Bits Yes
(1)
Both — unlocked
(1)
No
Read Data 16-Bits — Both — unlocked
(1)
No
Increment Wiper 8-Bits — Volatile Only — unlocked
(1)
No
Decrement Wiper 8-Bits — Volatile Only — unlocked
(1)
No
High Voltage Write Data 16-Bits Yes Both Yes unchanged No
High Voltage Read Data 16-Bits — Both Yes unchanged Yes
High Voltage Increment Wiper 8-Bits — Volatile Only Yes unchanged No
High Voltage Decrement Wiper 8-Bits — Volatile Only Yes unchanged No
Modify Write Protect or Wiper-
Lock Technology (High Voltage) -
Enable
8-Bits —
(2)
Non-Volatile
Only
(2)
Yes locked/
protected
(2)
Yes
Modify Write Protect or Wiper-
Lock Technology (High Voltage) -
Disable
8-Bits —
(3)
Non-Volatile
Only
(3)
Yes unlocked/
unprotected
(3)
Yes
Note 1: This command will only complete if wiper is “unlocked” (WiperLock Technology is Disabled).
2: If the command is executed using address 02h, 03h, 08h, or 09h then that corresponding wiper is locked or
if with address 0Fh, then Write Protect is enabled.
3: If the command is executed using with address 02h, 03h, 08h, or 09h, then that corresponding wiper is
unlocked or if with address 0Fh, then Write Protect is disabled.