Signal Descriptions
Table 1: Signal Descriptions
Signal Type Description
DQ1 Output Serial data: The DQ1 output signal is used to transfer data serially out of the device.
Data is shifted out on the falling edge of the serial clock (C).
DQ0 Input Serial data: The DQ0 input signal is used to transfer data serially into the device. It
receives commands, addresses, and the data to be programmed. Values are latched on
the rising edge of the serial clock (C).
C Input Clock: The C input signal provides the timing of the serial interface. Commands, ad-
dresses, or data present at serial data input (DQ0) is latched on the rising edge of the
serial clock (C). Data on DQ1 changes after the falling edge of C.
S# Input Chip select: When the S# input signal is HIGH, the device is deselected and DQ1 is at
high impedance. Unless an internal PROGRAM, ERASE, or WRITE STATUS REGISTER cy-
cle is in progress, the device will be in the standby power mode. Driving S# LOW ena-
bles the device, placing it in the active power mode. After power-up, a falling edge on
S# is required prior to the start of any command.
HOLD# Input Hold: The HOLD# signal is used to pause any serial communications with the device
without deselecting the device. During the hold condition, DQ1 is High-Z. DQ0 and C
are "Don’t Care." To start the hold condition, the device must be selected, with S#
driven LOW.
W#/V
PP
Input Write protect: The W#/V
PP
signal is both a control input and a power supply pin. The
two functions are selected by the voltage range applied to the pin. If the W#/V
PP
input
is kept in a low voltage range (0 V to V
CC
) the pin is seen as a control input. The W#
input signal is used to freeze the size of the area of memory that is protected against
program or erase commands as specified by the values in BP2, BP1, and BP0 bits of the
Status Register. V
PP
acts as an additional power supply if it is in the range of V
PPH
, as
defined in the AC Measurement Conditions table. Avoid applying V
PPH
to the W#/V
PP
pin during a BULK ERASE operation.
V
CC
Power Device core power supply: Source voltage.
V
SS
Ground Ground: Reference for the V
CC
supply voltage.
DNU – Do not use.
M25P128 Serial Flash Embedded Memory
Signal Descriptions
CCMTD-1718347970-10412
m25p_128.pdf - Rev. A 11/16 EN
7
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