T89C51RD2-RDTIM datasheet(54/104 Pages) ATMEL

54 / 104 page

T89C51RD2

4243G–8051–05/03

these devices is similar to that used by EPROM 87C51 but it is not identical and the

commercially available programmers need to have support for the T89C51RD2.

The bootloader and the In Application Programming (IAP) routines are located in the last

kilobyte of the Flash, leaving 63k bytes available for the application with ISP.

Flash Registers and

Memory Map

The T89C51RD2 Flash memory uses several registers for his management:

•

Flash control register is used to select the Flash memory spaces and launch the

Flash programming sequence.

•

Hardware registers can only be accessed through the parallel programming modes

which are handled by the parallel programmer.

•

Software registers are in a special page of the Flash memory which can be

accessed through the API or with the parallel programming modes. This page,

called "Extra Flash Memory", is not in the internal Flash program memory

addressing space.

Flash Register

Figure 20. FCON register

FCON (S:D1h) Flash control register

Reset Value = xxxx 0000b

The Flash programming application note and API source code are available on request.

Hardware register

The only hardware register of the T89C51RD2 is called Hardware Security Byte (HSB).

After full Flash erasure, the content of this byte is FFh; each bit is active at low level.

7654

3210

FPL3

FPL2

FPL1

FPL0

FPS

FMOD1

FMOD0

FBUSY

Bit

Number

Bit

Mnemonic

Description

7-4

FPL3:0

Programming Launch command bits

Write 5h followed by Ah to launch the programming.

3FPS

Flash Map Program Space

Clear to map the data space during MOVX

Set to map the Flash space during MOVX (write) or MOVC (read) instructions

(Write in the column latches)

2-1

FMOD1:0

Flash Mode

Select the addressed space

00: User (0000h-FFFFh)

01: XAF

10: Hardware byte

11: reserved

0FBUSY

Flash Busy

Set by hardware when programming is in progress.

Clear by hardware when programming is done.

Can not be cleared by software

T89C51RD2-RDTIM 数据表(PDF) 54 Page - ATMEL Corporation

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