24LC320 Ver la hoja de datos (PDF) - Microchip Technology

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24LC320

32K 2.5V SPI™ Bus Serial EEPROM

Microchip Technology 

25LC320

FIGURE 2-1: WRITE TO STATUS REGISTER AND/OR ARRAY FLOWCHART

CS Returns High

Write

No

to Status

Reg?

Yes

No

WEL = 1?

Yes

No

WP is low?

Yes

No

WPEN = 1?

Yes

Write to

Status Register

Do not write to

Status Register

Continue

Write

No

to array?

Yes

No

WEL = 1?

Yes

Write to the

Unprotected Block

To other

Commands

Do not write to

Array

From other

Commands

2.3 Write Status Register (WRSR)

The WRSR instruction allows the user to select one of

four protection options for the array by writing to the

appropriate bits in the status register. The array is

divided up into four segments. The user has the ability

to write protect none, one, two, or all four of the seg-

ments of the array. The partitioning is controlled as illus-

trated in Table 2-3.

See Figure 3-6 for WRSR timing sequence.

TABLE 2-3:

BP1

0

0

1

1

ARRAY PROTECTION

BP0

Array Addresses

Write Protected

0

none

1

upper 1/4

0C00h - 0FFFh

0

upper 1/2

0800h - 0FFFh

1

all

0000h - 0FFFh

DS21158B-page 6

Preliminary

© 1996 Microchip Technology Inc.

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