MCP4441 datasheet(71/100 Pages) MICROCHIP

71 / 100 page

DS22265A-page 71

MCP444X/446X

7.8

Modify Write Protect or WiperLock

Technology (High Voltage)

Enable and Disable

These commands are special cases of the High

Voltage Decrement Wiper and the High Voltage

Increment Wiper

commands to the nonvolatile

memory locations 02h, 03h, 08h, 09h, and 0Fh. This

command is used to enable or disable either the

software Write Protect, wiper 0 WiperLock Technology,

wiper 1 WiperLock Technology, wiper 2 WiperLock

Technology, or wiper 3 WiperLock Technology. Table 7-

6 shows the memory addresses, the High Voltage

command and the result of those commands on the

nonvolatile WP, WL0, or WL1 bits.

7.8.1

SINGLE MODIFY (ENABLE OR

DISABLE) WRITE PROTECT OR

WIPERLOCK TECHNOLOGY (HIGH

VOLTAGE)

Figure 7-9 (Disable) and Figure 7-10 (Enable) show

the formats for a single Modify Write Protect or

Wiper-Lock Technology command.

A Modify Write Protect or WiperLock Technology

Command will only start an EEPROM write cycle (twc)

after a properly formatted Command has been

received and the Stop condition occurs.

During an EEPROM write cycle, only serial commands

to Volatile memory (addresses 00h, 01h, 04h, and 05h)

are accepted. All other serial commands are ignored

until the EEPROM write cycle (twc) completes. This

allows the Host Controller to operate on the Volatile

Wiper registers and the TCON register, and to Read

the Status Register. The EEWA bit in the Status register

indicates the status of an EEPROM Write Cycle.

TABLE 7-6:

ADDRESS MAP TO MODIFY WRITE PROTECT AND WIPERLOCK TECHNOLOGY

Memory

Address

Commands and Results

High Voltage Decrement Wiper

High Voltage Increment Wiper

00h

Wiper 0 register is decremented

Wiper 0 register is incremented

01h

Wiper 1 register is decremented

Wiper 1 register is incremented

02h

WL0 is enabled

WL0 is disabled

03h

WL1 is enabled

WL1 is disabled

04h (1)

TCON0 register not changed

05h (1)

STATUS register not changed

06h

Wiper 2 register is decremented

Wiper 2 register is incremented

07h

Wiper 3 register is decremented

Wiper 3 register is incremented

08h

WL2 is enabled

WL2 is disabled

09h

WL3 is enabled

WL3 is disabled

0Ah (1)

TCON1 register not changed

0Bh - 0Eh (1)

Reserved

0Fh

WP is enabled

WP is disabled

Note 1:

Reserved addresses:

Increment or Decrement commands are invalid for these addresses.

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