T89C51RD2-3CSCM 查看數據表（PDF） - Atmel Corporation

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T89C51RD2-3CSCM

0 to 40MHz Flash Programmable 8-bit Microcontroller

Atmel Corporation 

Example

Display data from address 0000h to 0020h

HOST

: 05 0000 04 0000 0020 00 D7

BOOTLOADER : 05 0000 04 0000 0020 00 D7

BOOTLOADER 0000=-----data------ CR LF (16 data)

BOOTLOADER 0010=-----data------ CR LF (16 data)

BOOTLOADER 0020=data CR LF

( 1 data)

Read Function

This flow is similar for the following frames:

• Reading Frame

• EOF Frame/Atmel Frame (only reading Atmel Frame)

Description

Figure 30. Read Flow

Host

Bootloader

Send Read Command

Read Command

Wait Read Command

OR

Wait Checksum Error

COMMAND ABORTED

’X’ & twice (CR & LF)

OR

Wait Security Error

COMMAND ABORTED

’L’ & CR & LF

Wait Value of Data

COMMAND FINISHED

’value’ & ’.’ & CR & LF

Checksum error

Send Checksum error

RD_WR_SECURITY

Send Security error

Read Value

Send Data Read

Example

Read function (read SBV)

HOST

: 02 0000 05 07 02 F0

BOOTLOADER : 02 0000 05 07 02 F0 Value . CR LF

Atmel Read function (read Bootloader version)

HOST

: 02 0000 01 02 00 FB

BOOTLOADER : 02 0000 01 02 00 FB Value . CR LF

72 T89C51RD2

4243G–8051–05/03

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