ESP32 Bit Pirate

Microwire memory target

93Cxx Microwire EEPROM reading and writing on ESP32

Wire 93Cxx Microwire EEPROM chips to ESP32 or ESP32-S3 and use ESP32 Bit Pirate to open the dedicated 3-Wire EEPROM shell for probe, read bytes, dump EEPROM, write bytes and erase actions.

Start here when connecting a 93Cxx or Microwire EEPROM to ESP32 for chip identification, organization checks and read-first memory debugging. Confirm the device family before any write or erase operation.

  • 93Cxx
  • Microwire
  • read
  • write
Open recipesChoose a board
SPI flash adapter board used for small EEPROM chips.

reading and writing

Start with 93Cxx probe and backup

Confirm the 93Cxx part number, voltage and x8 or x16 organization before writing. Probe the EEPROM first, then read bytes or create a full dump before any write-enable, erase or patch action.

  1. 01

    Identify the exact 93Cxx chip and whether it is organized as x8 or x16.

  2. 02

    Confirm VCC, GND, CS, CLK, DI and DO pins before powering the chip.

  3. 03

    Open the dedicated eeprom shell and start with Probe to confirm size and x8/x16 organization.

  4. 04

    Use Read bytes or Dump EEPROM from the shell before write/erase actions.

  5. 05

    Use erase only on lab chips or devices you are authorized to modify.

Example CLI flow
mode 3wire
config
eeprom       # open the 3-Wire EEPROM shell

Use this as a reading and writing preview. Inside the EEPROM shell, start with Probe, then use Read bytes or Dump EEPROM before any write or erase action.

hardware reminders

93Cxx EEPROM wiring notes before power

Confirm the 93Cxx package, x8 or x16 organization, CS/SK/DI/DO pins and safe supply before clipping onto the EEPROM.

Wiring View

93CxxBP 3-WireCSCS GPIOSKCLK GPIODIMOSI GPIODOMISO GPIOVCC/GNDsafe supply
Generated wiring summary: 93Cxx to BP 3-Wire. Confirm the 93Cxx pinout and organization before power.
Organization

Wrong x8/x16 assumptions make dumps look scrambled.

Pinout

93Cxx variants and packages differ; check the datasheet.

Write enable

Write/erase flows often require explicit enable steps.

Before wiring a module or target chip, check pinout, voltage, ground reference and whether the selected ESP32-S3 board has the required pins free.

task-level guides

Detailed 93Cxx Microwire EEPROM recipes

Use these 93Cxx guides for Microwire wiring, probe, dump, byte patching and safe lab erase steps.

Dump Microwire 93C EEPROM

Task-level guide with wiring, commands and troubleshooting steps.

Erase lab 93Cxx EEPROM

Task-level guide with wiring, commands and troubleshooting steps.

what it is

What 93Cxx EEPROM is used for

93Cxx EEPROMs use Microwire / 3-wire-style signalling and are common in small configuration storage and legacy embedded targets.

practical value

Why use 93Cxx EEPROM with ESP32 Bit Pirate

ESP32 Bit Pirate gives these chips a focused 3-Wire EEPROM shell for probing organization, reading bytes, dumping contents and performing controlled lab writes/erases.

common symptoms

Common problems with 93Cxx Microwire EEPROM

93Cxx failures usually come from chip organization, CS/CLK/DI/DO wiring, voltage or write-enable state. Check those before changing memory.

Read returns all FF

Check CS, DO line, power and organization.

Data looks interleaved

The x8/x16 organization may be wrong.

Write does nothing

Check write-enable behavior and whether the chip or board protects writes.

pages

Useful 93Cxx EEPROM next pages

Jump from 93Cxx EEPROM wiring to the 3-Wire protocol, dump/write recipes and hardware notes for safe bench work.

3-Wire

Protocol overview for 3-Wire EEPROM reading and writing.

ESP32-S3 DevKit

Board-specific notes for using 93Cxx Microwire EEPROM with ESP32 Bit Pirate.

Dump Microwire 93C EEPROM

Use the 3-Wire EEPROM shell dump action after Probe.

Write 93Cxx EEPROM bytes

Patch bytes on a lab 93Cxx EEPROM safely.

Erase lab 93Cxx EEPROM

Clear a reusable Microwire EEPROM target.

Web Serial Terminal

Use Web Serial for 3-Wire EEPROM probe, dump and byte-write commands.

Hardware ecosystem

Dock, adapters, level notes and physical hardware context.

module-specific answers

93Cxx Microwire EEPROM FAQ

Quick answers about 93Cxx organization, 3-Wire wiring, EEPROM dumps and safe erase/write checks.

Can ESP32 Bit Pirate read 93Cxx EEPROMs?

Yes. Use mode 3wire, configure the pins, then open the dedicated eeprom shell.

Why does organization matter?

93Cxx chips can expose x8 or x16 organization, which changes how data should be interpreted.

Can I erase a chip?

Only on lab chips or targets you are authorized to modify, after taking a backup.

Is this I2C?

No. 93Cxx EEPROMs use Microwire / 3-Wire-style signalling, not I2C.

Where should I start?

Start with the 3-Wire protocol page and the EEPROM shell Probe action.

project

93Cxx EEPROM inside ESP32 Bit Pirate.

The 93Cxx EEPROM page links Microwire protocol notes, dump/write recipes, board wiring and browser serial access for safe memory work.