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

Part Name

Description

Manufacturer

T89C51RD2-3CSCM

0 to 40MHz Flash Programmable 8-bit Microcontroller

Atmel Corporation 

T89C51RD2

Flash Parallel

Programming

Signature Bytes

Four hardware read only registers have to be accessed with parallel static test modes

(mode TMS) in order to control the Flash parallel programmimg:

• Manufacturer code

• Device ID # 1: Family code

• Device ID # 2: Memories size and type

• Device ID # 3: Name and revision

As these registers can only be accessed by hardware, they must be read by the parallel

programmers and then copied in the XAF in order to make their values accessible by

software (ISP or API).

Set-up modes Configuration In order to program and verify the Flash or to read the signature bytes, the T89C51RD2

is placed in specific set-up modes. (See Figure 31.)

Figure 31. Set-Up Modes Configuration

PROGRAM

SIGNALS*

+5V

EA

VCC

ALE/PROG

P0.0-P0.7

CONTROL

SIGNALS*

4 to 6 MHz

RST

PSEN

P2.6

P2.7

P3.3

P3.6

P3.7

XTAL1

P1.0-P1.7

P2.0-P2.5

P3.4

P3.5

VSS

GND

D0-D7

A0-A7

A8-A13

A14

A15

Definition of Terms

Address Lines:P1.0-P1.7, P2.0-P2.5, P3.4-P3.5, respectively for A0-A15.

Data Lines:P0.0-P0.7 for D0-D7

Control Signals:RST, PSEN, P2.6, P2.7, P3.2, P3.3, P3.6, P3.7.

Program Signals: ALE/PROG, EA

75

4243G–8051–05/03

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