25AA512 datasheet(12/36 Pages) MICROCHIP

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25AA512

DS22021F-page 12

 2010 Microchip Technology Inc.

2.4

Read Status Register Instruction

(RDSR)

The Read Status Register instruction (RDSR) provides

access to the STATUS register. The STATUS register

may be read at any time, even during a write cycle. The

STATUS register is formatted as follows:

TABLE 2-2:

STATUS REGISTER

The Write-In-Process (WIP) bit indicates whether the

25AA512 is busy with a write operation. When set to a

‘

1’, a write is in progress, when set to a ‘0’, no write is

in progress. This bit is read-only.

The Write Enable Latch (WEL) bit indicates the status

of the write enable latch and is read-only. When set to

a ‘

1’, the latch allows writes to the array, when set to a

‘

0’, the latch prohibits writes to the array. The state of

this bit can always be updated via the WREN or WRDI

commands regardless of the state of write protection

on the STATUS register. These commands are shown

in Figure 2-4 and Figure 2-5.

The Block Protection (BP0 and BP1) bits indicate

which blocks are currently write-protected. These bits

are set by the user issuing the WRSR instruction. These

bits are nonvolatile, and are shown in Table 2-3.

See Figure 2-6 for the RDSR timing sequence.

FIGURE 2-6:

READ STATUS REGISTER TIMING SEQUENCE (RDSR)

654

W/R

–––

W/R

WPEN

BP1

BP0

WEL

WIP

W/R = writable/readable. R = read-only.

1011

12131415

Instruction

Data from STATUS Register

High-Impedance

SCK

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