25LC1024-ESLASHP datasheet(6/32 Pages) MICROCHIP

6 / 32 page

25LC1024

DS22064C-page 6

2.0

FUNCTIONAL DESCRIPTION

2.1

Principles of Operation

The 25LC1024 is a 131,072 byte Serial EEPROM

designed to interface directly with the Serial Peripheral

Interface (SPI) port of many of today’s popular

microcontroller families, including Microchip’s PIC®

microcontrollers. It may also interface with microcon-

trollers that do not have a built-in SPI port by using

discrete I/O lines programmed properly in firmware to

match the SPI protocol.

The 25LC1024 contains an 8-bit instruction register.

The device is accessed via the SI pin, with data being

clocked in on the rising edge of SCK. The CS pin must

be low and the HOLD pin must be high for the entire

operation.

Table 2-1 contains a list of the possible instruction

bytes and format for device operation. All instructions,

addresses and data are transferred MSB first, LSB last.

Data (SI) is sampled on the first rising edge of SCK

after CS goes low. If the clock line is shared with other

peripheral devices on the SPI bus, the user can assert

the HOLD input and place the 25LC1024 in ‘HOLD’

mode. After releasing the HOLD pin, operation will

resume from the point when the HOLD was asserted.

BLOCK DIAGRAM

TABLE 2-1:

INSTRUCTION SET

SCK

HOLD

STATUS

I/O Control

Memory

Control

Logic

Dec

HV Generator

EEPROM

Array

Page Latches

Y Decoder

Sense Amp.

R/W Control

Logic

VCC

VSS

Instruction Name

Instruction Format

Description

READ

0000 0011

Read data from memory array beginning at selected address

WRITE

0000 0010

Write data to memory array beginning at selected address

WREN

0000 0110

Set the write enable latch (enable write operations)

WRDI

0000 0100

Reset the write enable latch (disable write operations)

RDSR

0000 0101

Read STATUS register

WRSR

0000 0001

Write STATUS register

0100 0010

Page Erase – erase one page in memory array

1101 1000

Sector Erase – erase one sector in memory array

1100 0111

Chip Erase – erase all sectors in memory array

RDID

1010 1011

Release from Deep power-down and read electronic signature

DPD

1011 1001

Deep Power-Down mode

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