T89C51RD2-3CSCM View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

T89C51RD2-3CSCM

0 to 40MHz Flash Programmable 8-bit Microcontroller

Atmel Corporation 

Boot Process

Figure 24. Bootloader Process

RESET

Hardware

Condition?

Yes (PSEN = 0, EA = 1,

and ALE = 1 or not connected)

Yes

BLJB = 1

?

JUMP to 0000h

User Application

JUMP to FC03h

BSB=0

BSB = 00h

?

SBV = FCh

?

SBV=FCh

SBV=XXh

JUMP to XX00h

User Boot Loader

JUMP to FC00h

Default Boot Loader

62 T89C51RD2

4243G–8051–05/03

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