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  1. 1ATMEGA324 MCU attack
  2. 2AT89C51ED2 MCU Reverse service
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  4. 4AT89S51 MCU Code Extraction
  5. 5AT89C51 MCU Reverse and Program
  6. 6AT89S8253 Memory Brown-out Prot
Atmel MCU Code Extraction

AT89S8253 EEPROM Introduction

  Time:2013-09-17 11:14
AT89S8253 mcu reverse/ic crack/pcb clone/mcu decryption/code extraction
The AT89S8253 is a low-power, high-performance CMOS 8-bit microcontroller with
12K bytes of In-System Programmable (ISP) Flash program memory and 2K bytes of
EEPROM data memory. 
The AT89S8253 includes 2K bytes of on-chip EEPROM for nonvolatile data storage. 
EEPROM and external data memory are accessible by indirect addressing only, utilizing 
the MOVX instructions, which come in two modes: 8-bit and 16-bit. Only the 16-bit 
MOVX instructions (those utilizing DPTR) may be used to access internal EEPROM.To 
access EEPROM, EEMEN is set; to access external data memory, EEMEN is cleared.
Reset clears EEMEN. To enable write accesses to EEPROM,bit EEMWE in SFR
EECON must also be set. The 2K bytes of EEPROM are accessed at addresses
000H - 7FFH.Accesses to EEPROM are distinguished from accesses to external
data memory by the state of the EEMEN bit in SFR EECON (96H). 
we can extract the AT89S8253 EEPROM proframe data code.
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