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M25P10

1 Mbit Low Voltage Paged Flash Memory With 20 MHz Serial SPI Bus Interface

STMicroelectronics 

M25P10

Table 7. Status Register Format

b7

b0

SRWD 0 0 0 BP1 BP0 WEL WIP

Note: 1. SRWD, BP0 and BP1 are non-volatile read and write bits.

2. WEL and WIP are volatile read-only bits (WEL is set and

reset by specific instructions; WIP is automatically set

and reset by the internal logic of the device).

internally taken into account if, and only if, (BP0,

BP1) = (0,0).

SRWD bit: The SRWD bit operates together with

the W pin. SRWD bit and W pin allow the part to

be put in the Hardware protected mode. In this

mode (W pin = 0 and SRWD = 1), the non-volatile

bits of the Status Register (SRWD, BP1, BP0)

become read only bits and the Write Status

Register (WRSR) instruction has no more effect

on the device (please see the section entitled

“Write Protect (W)” on page 2, and Table 3).

Write in the Status Register (WRSR)

Prior to any WRSR instruction, a write enable

instruction (WREN) must have been previously

sent (the S input driven low, WREN instruction

properly transmitted and the S input driven high).

After the WREN instruction decoding, the memory

sets the Write Enable Latch (WEL) which allows

the execution of any further WRSR instruction.

The WRSR instruction is entered by driving the

Chip select input (S) low, followed by the

instruction byte and the data byte on Data In input

(D). WRSR instruction has no effect on b6, b5, b4,

b1 and b0 of the Status Register. b6, b5 and b4 are

always read at ’0’.

The device must be deselected just after the

eighth bit of the data byte has been latched in. If

not, the WRSR instruction is not executed. As

soon as the device is deselected, the self-timed

Write Status Register cycle (tW) is initiated. While

the Write Status Register cycle is in progress, the

Status Register may still be read to check the WIP

bit value. WIP is high during the self-timed Write

Status Register cycle and is low when it is

completed. When the cycle is completed, the write

enable latch (WEL) is reset.

The WRSR instruction allows the user to define

the size of the software Protected area (Read

Only) when setting the BP1,BP0 values, according

to Table 4. The WRSR instruction also allows the

user to set or reset the SRWD bit in accordance

with the W pin. SRWD bit and W pin allow the part

to be put in the Hardware protected mode (please

see the sections entitled “Read Status Register

(RDSR)” on page 8, “Write Protect (W)” on page 2,

and Table 3). WRSR instruction has no effect on

Figure 12. PP: Page Program Sequence

S

0 1 2 3 4 5 6 7 8 9 10 28 29 30 31 32 33 34 35 36 37 38 39

C

INSTRUCTION

24 BIT ADDRESS

DATA BYTE 1

D

23 22 21 3 2 1 0 7 6 5 4 3 2 1 0

S

40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55

C

DATA BYTE 2

DATA BYTE 3

DATA BYTE 128

D

7654321076543210

6543210

Note: 1. Address bits A23 to A17 are Don’t Care on the M25P10 series.

AI03749

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