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

Part Name

Description

Manufacturer

T89C51RD2-3CSCM

0 to 40MHz Flash Programmable 8-bit Microcontroller

Atmel Corporation 

T89C51RD2

Figure 32. Programming and Verification Signal’s Waveform

Programming Cycle

A0-A15

Read/Verify Cycle

D0-D7

ALE/PROG

Data In

Data Out

48 clk (load latch ) or 10 ms (write) or 100 ms (erase)

EA

5V

0V

Control signals

P2.7

Extra Memory Mapping

The memory mapping the T89C51RD2 software registers in the Extra Flash memory is

described in the table below.

Table 42. Extra Row Memory Mapping (XAF)

Copy of device ID #3

Copy of device ID #2

Copy of device ID #1

Copy of Manufacturer Code:

ATMEL

Software Security Byte (level 1 by

default)

Copy of HSB (level 4 by default

and BLJB = 0)

Software Boot Vector

Boot Status Byte

All other addresses are reserved

Address

0061h

0060h

0031h

0030h

0005h

0004h

0001h

0000h

Default content

FFh

FCh

D7h

58h

FFh

18h or 1Bh

FCh

FFh

79

4243G–8051–05/03

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