MCP4142T-502ESLASHST datasheet(57/88 Pages) MICROCHIP

57 / 88 page

DS22059B-page 57

MCP414X/416X/424X/426X

7.9

Modify Write Protect or WiperLock

Technology (High Voltage)

Enable and Disable

This command is a special case of the High Voltage

Decrement Wiper

and High Voltage Increment Wiper

commands to the non-volatile memory locations 02h,

03h, and 0Fh. This command is used to enable or

disable either the software Write Protect, wiper 0

WiperLock Technology, or wiper 1 WiperLock Technol-

ogy. Table 7-6 shows the memory addresses, the High

Voltage command and the result of those commands

on the non-volatile WP, WL0, 0r WL1 bits. The format

of the command is shown in Figure 7-8 (Enable) or

Figure 7-6 (Disable).

7.9.1

SINGLE ENABLE WRITE PROTECT

OR WIPERLOCK TECHNOLOGY

(HIGH VOLTAGE)

Figure 6-7

through

Figure 6-8

show

possible

waveforms for a single Modify Write Protect or

WiperLock Technology command.

A Modify Write Protect or WiperLock Technology

Command will only start an EEPROM write cycle (twc)

after a properly formatted Command (8-clocks) has

been received and the CS pin transitions to the inactive

state (VIH).

After the CS pin is driven inactive (VIH), the serial

interface may immediately be re-enabled by driving the

CS pin to the active state (VILor VIHH).

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

Command’s and Result

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)

TCON register not changed, CMDERR bit is set TCON register not changed, CMDERR bit is set

05h - 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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