M45PE10 datasheet(5/34 Pages) STMICROELECTRONICS

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M45PE10

SIGNAL DESCRIPTION

Serial Data Output (Q). This output signal is

used to transfer data serially out of the device.

Data is shifted out on the falling edge of Serial

Clock (C).

Serial Data Input (D). This input signal is used to

transfer data serially into the device. It receives in-

structions, addresses, and the data to be pro-

grammed. Values are latched on the rising edge of

Serial Clock (C).

Serial Clock (C). This input signal provides the

timing of the serial interface. Instructions, address-

es, or data present at Serial Data Input (D) are

latched on the rising edge of Serial Clock (C). Data

on Serial Data Output (Q) changes after the falling

edge of Serial Clock (C).

Chip Select (S). When this input signal is High,

the device is deselected and Serial Data Output

(Q) is at high impedance. Unless an internal Read,

Program, Erase or Write cycle is in progress, the

device will be in the Standby Power mode (this is

not the Deep Power-down mode). Driving Chip

Select (S) Low selects the device, placing it in the

Active Power mode.

After Power-up, a falling edge on Chip Select (S)

is required prior to the start of any instruction.

Reset (Reset). The Reset (Reset) input provides

a hardware reset for the memory. In this mode, the

outputs are high impedance.

When Reset (Reset) is driven High, the memory is

in the normal operating mode. When Reset (Re-

set) is driven Low, the memory will enter the Reset

mode, provided that no internal operation is cur-

rently in progress. Driving Reset (Reset) Low while

an internal operation is in progress has no effect

on that internal operation (a write cycle, program

cycle, or erase cycle).

Write Protect (W). This input signal puts the de-

vice in the Hardware Protected mode, when Write

Protect (W) is connected to VSS, causing the first

256 pages of memory to become read-only by pro-

tecting them from write, program and erase oper-

ations. When Write Protect (W) is connected to

VCC, the first 256 pages of memory behave like

the other pages of memory.

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