MCP98242-BESLASHST datasheet(34/52 Pages) MICROCHIP

tên linh kiện	MCP98242-BE/ST

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MCP98242

DS21996C-page 34

5.3.3.3

PWP (Permanent Write Protect)

Once the PWP register is written, the lower half of the

memory will be permanent protected and the device

will not acknowledge any command. The protected

area of the memory can not be cleared, reversed, or

re-written. If a write is attempted to the protected area,

the device will acknowledge the address byte and word

address but not the data byte. (See Table 5-4 and

Table 5-5).

Unlike SWP and CWP, a VHI_WP is not applied on the

A0 pin to execute PWP. The state of A2, A1, and A0 is

user selectable. However, the address pin states need

to match the slave address bits, as shown in Table 5-3.

FIGURE 5-14:

Timing Diagram for Setting Permanently Write Protect (See Section 4.0 “Serial

Communication”).

Note:

Once the Permanent Write-Protect is

executed, it cannot be reversed, even if the

device power is cycled.

SDA

345

SCLK

Address Byte

MCP98242

567

Data

Word Address

MCP98242

Note:

Unlike SWP and CWP, a VHI_WP is not applied on the A0 pin to execute PWP.

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