25CS160-HSLASHMS datasheet(19/53 Pages) MICROCHIP

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Preliminary

DS20007008B-page 19

25CS160

6.1.1

WRITE-PROTECT ENABLE BIT

The Write-Protect Enable (WPEN) bit in the STATUS

the WP pin to inhibit writing to the various registers

within the device.

The device is hardware write-protected when both the

WP pin is low and the WPEN bit has been set to a

logic ‘1’.

When the device is hardware write-protected, the

nonvolatile bits of the STATUS register (WPEN, BP1,

BP0) become read-only and the Write STATUS

and Writing the Undervoltage Lockout Detector (WUVL)

instructions will not be accepted.

STATUS REGISTER (BYTE 1)

U-0

R-0

U-0

R-0

U-0

R-0

—ECS

—

—WLS

—

RDY/BSY

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7

Unimplemented: Read as ‘0’

bit 6

ECS: Error Correction State Latch

1 = The previous executed read sequence did require the Error Correction Code (ECC)

0 = The previous executed read sequence did not require the Error Correction Code (ECC)

bit 5

Unimplemented: Read as ‘0’

bit 4

Unimplemented: Read as ‘0’

bit 3

Unimplemented: Read as ‘0’

bit 2

WLS: Write Lockout State

1 = The previous nonvolatile write sequence was blocked by the UVLO

0 = The previous nonvolatile write sequence was not blocked by the UVLO

bit 1

Unimplemented: Read as ‘0’

bit 0

RDY/BSY: Ready/Busy Status Latch

1 = Device is busy with an internal write cycle

0 = Device is ready for a new sequence

TABLE 6-1:

WRITE-PROTECT FUNCTIONALITY MATRIX

Write Protection Mode

WP Pin

WPEN Bit

STATUS Register

UVLO

Legacy

Low

Not Protected

Low

Protected

High

Not Protected

Note 1: When the WPEN bit is a logic ‘1’, it cannot be changed back to a logic ‘0’ as long as the WP pin is

asserted (low).

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