M25PE10-VMN6TP datasheet(10/64 Pages) NUMONYX

Part #	M25PE10-VMN6TP

Description	1 and 2 Mbit, page-erasable serial Flash memories with byte alterability, 75 MHz SPI bus, standard pinout

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Manufacturer	NUMONYX [Numonyx B.V]

Direct Link	http://www.numonyx.com

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10 / 64 page

SPI modes

M25PE20, M25PE10

10/64

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 Standby 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 or Top Sector Lock (W or TSL) signal 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 M25PE20 or M25PE10 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*Cp (Cp = parasitic

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

SPI bus in high impedance.

AI13558b

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

or

TSL

Reset

W

or

TSL

Reset

W

or

TSL

Reset

RR

R

VCC

VSS

R

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M25PE10-VMN6TP Datasheet(PDF) 10 Page - Numonyx B.V

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