T89C51RD2-3CWC-L datasheet(64/86 Pages) ATMEL

Il numero della parte	T89C51RD2-3CWC-L

Spiegazioni elettronici	0 to 40MHz Flash Programmable 8-bit Microcontroller

PDF	86 Pages

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Produttore elettronici	ATMEL [ATMEL Corporation]

Homepage	http://www.atmel.com

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64 / 86 page

Rev. F - 15 February, 2001

T89C51RD2

Note: These functions can only be called by user’s code. The standard boot loader cannot decrease the security level.

8.9. FLASH Parallel Programming

8.9.1. 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).

8.9.2. Set-up modes

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 22).

Control and program signals must be held at the levels indicated in Table 37. and Table 38.(Please notice that

each mode is defined over the two tables

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