M25P64_07 datasheet(11/49 Pages) STMICROELECTRONICS

Part #	M25P64

Description	64 Mbit, Low Voltage, Serial Flash Memory With 50MHz SPI Bus Interface

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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M25P64

SPI modes

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3

SPI modes

These devices can be driven by a microcontroller with its SPI peripheral running in either of

the two following modes:

●

CPOL=0, CPHA=0

●

CPOL=1, CPHA=1

For these two modes, input data is latched in on the rising edge of Serial Clock (C), and

output data is available from the falling edge of Serial Clock (C).

The difference between the two modes, as shown in Figure 5, is the clock polarity when the

bus master is in Stand-by mode and not transferring data:

●

C remains at 0 for (CPOL=0, CPHA=0)

●

C remains at 1 for (CPOL=1, CPHA=1)

Figure 4.

Bus master and memory devices on the SPI bus

1.

The Write Protect (W/VPP) and Hold (HOLD) signals should be driven, High or Low as appropriate.

Figure 4 shows an example of three devices connected to an MCU, on an SPI bus. Only one

device is selected at a time, so only one device drives the Serial Data Output (Q) line at a

time, the other devices are high impedance. Resistors R (represented in Figure 4) ensure

that the M25P64 is not selected if the Bus Master leaves the S line in the high impedance

state. As the Bus Master may enter a state where all inputs/outputs are in high impedance

at the same time (for example, when the Bus Master is reset), the clock line (C) must be

connected to an external pull-down resistor so that, when all inputs/outputs become high

impedance, the S line is pulled High while the C line is pulled Low (thus ensuring that S and

C do not become High at the same time, and so, that the tSHCH requirement is met). The

typical value of R is 100 k

Ω, assuming that the time constant R*C

p (Cp = parasitic

capacitance of the bus line) is shorter than the time during which the Bus Master leaves the

SPI bus in high impedance.

AI13792

SPI Bus Master

SPI Memory

Device

SDO

SDI

SCK

CQD

S

SPI Memory

Device

CQD

S

SPI Memory

Device

CQD

S

CS3

CS2 CS1

SPI Interface with

(CPOL, CPHA) =

(0, 0) or (1, 1)

W/VPP HOLD

HOLD

RR

R

VCC

VSS

R

W/VPP

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