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Migration from AT89C51RD2/ED2/ID2 to
AT89C51RE2
This application note is a guide to assist cu rrent AT89C51RD2/ED2/ID2 users in con-
verting existing designs to the AT89C51RE2 device. Check t he product datasheet for
detailed information.
To permit an easy migratio n, this app lication note compares the features, memory
organization/accesses, SFRs and bootloader functionality.
Feature Comparison
Description AT89C51xD2 AT89C51RE2
Program Memory Full 64K bytes program/code memory
Full 128K bytes
program/code memory
In-System Programming (ISP) UART bootloader
UART bootloader based on
a new protocol to speed up
the download time
XRAM 1792 bytes 8192 bytes
Stack depth 256 bytes 512 bytes
On-Chip EEPROM data
2048 bytes
byte write (ED2 only)
No
UART 1 2
Internal Interrupt sources 9/10
(1)
10
Packages
PLCC44
VQFP44
PLCC68
VQFP64
PDIL40
PLCC44
VQFP44
VQFP64
Pinout AT89C51RD2/ED2 and AT89C51RE2 are pinout compatible.
8051
Microcontrollers
Application Note
Rev. 7667B–8051–03/07
