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

Part Name

Description

Manufacturer

T89C51RD2-3CSCM

0 to 40MHz Flash Programmable 8-bit Microcontroller

Atmel Corporation 

Command Data Stream Protocol

All commands are sent using the same flow. Each frame sent by the host is echoed by

the bootloader.

Figure 26. Command Flow

Host

Bootloader

Sends first character of the

":"

Frame

":"

If (not received ":")

Else

Sends echo and start

reception

Sends frame (made of 2 ASCII

characters per Byte)

Echo analysis

Gets frame, and sends back ec

for each received Byte

Write/Program Commands

This flow is common to the following frames:

• Flash/EEPROM Programming Data Frame

• EOF or Atmel Frame (only Programming Atmel Frame)

• Config Byte Programming Data Frame

• Baud Rate Frame

68 T89C51RD2

4243G–8051–05/03

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