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M25P10

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

STMicroelectronics 

M25P10

Figure 5. M25P10-Compatible SPI Modes

CPOL CPHA

0

0

C

1

1

C

D or Q

MSB

LSB

AI01438

Clock Polarity (CPOL) and Clock Phase

(CPHA) with SPI Bus

As shown in Figure 5, the M25P10 can be driven

by a microcontroller with its SPI peripheral running

in either of the two following modes: (CPOL,

CPHA) = (’0’, ’0’) or (CPOL, CPHA) = (’1’, ’1’). For

these two modes, input data is latched in by the

low to high transition of clock C, and output data is

available from the high to low transition of Clock

(C).The difference between (CPOL, CPHA) = (0,

0) and (CPOL, CPHA) = (1, 1) is the clock polarity

when in stand-by: C remains at ’0’ for (CPOL,

CPHA) = (0, 0) and C remains at ’1’ for (CPOL,

CPHA) = (1, 1) when there is no data transfer.

MEMORY ORGANIZATION

The memory is organized in 131,072 words of 8

bits each. The device features 1,024 pages of 128

bytes each. Each page can be individually

programmed (bits are programmed from ‘1’ to ’0’

state).

The device is also organized in 4 sectors of

262,144 bits (32,768 x 8 bits) each.The device is

Sector or Bulk Erasable but not Page Erasable

(bits are erased from ’0’ to ’1’ state).

OPERATIONS

All instructions, addresses and data are shifted in

and out of the chip MSB first. Data input (D) is

sampled on the first rising edge of clock (C) after

the chip select (S) goes low. Prior to any

Table 4. Memory Organization

Sector

Address Range

3

18000h

1FFFFh

2

10000h

17FFFh

1

08000h

0FFFFh

0

00000h

07FFFh

Table 3. Protection Features

W SRWD

Status Register (SR)

Data Bytes (Software

Protected Area by BPi bits)

Mode

Data Bytes (Unprotected

Area)

X

0

Writeable after setting WEL

Software protected by the BPi

bits of the Status Register

SPM

Paged Programmable and

Sector Erasable

1

1

Writeable after setting WEL

Software protected by the BPi

bits of the Status Register

SPM

Paged Programmable and

Sector Erasable

0

1

Hardware protected

Hardware protected by the

BPi bits of the Status Register

and the W pin

HPM

Note: 1. SPM: Software Protected Mode.

2. HPM: Hardware Protected Mode.

3. BPi: Bits BP0 and BP1 of the Status Register.

4. WEL: Write Enable Latch of the Status Register.

5. W: Write Protect Input Pin.

6. SRWD: Status Register Write Disable Bits of the Status Register.

7. The device is Bulk Erasable if, and only if, (BP0, BP1) = (0, 0), (see Bulk Erase paragraph).

Paged Programmable and

Sector Erasable

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