AT89C51AC3_04 Datasheet, PDF (12/26 Pages) ATMEL Corporation – Microcontrollers

Example
Blank Check ok
HOST
: 05 0000 04 0000 7FFF 01 78
BOOTLOADER : 05 0000 04 0000 7FFF 01 78 . CR LF
Blank Check ko at address xxxx
HOST
: 05 0000 04 0000 7FFF 01 78
BOOTLOADER : 05 0000 04 0000 7FFF 01 78 xxxx CR LF
Blank Check with checksum error
HOST
: 05 0000 04 0000 7FFF 01 70
BOOTLOADER : 05 0000 04 0000 7FFF 01 70 X CR LF CR LF
Flow Description: Read
Command
Host
Send Display Command
Display Command
Bootloader
Wait Display Command
OR
Wait Checksum Error
COMMAND ABORTED
’X’ & CR & LF
OR
Wait Security Error
COMMAND ABORTED
’L’ & CR & LF
Checksum error
Send Checksum Error
RD_WR_SECURITY
Send Security Error
Read Data
All data read
Wait Display Data
"Address = "
"Reading value"
CR & LF
Complete Frame
Send Display Data
All data read
All data read
COMMAND FINISHED
COMMAND FINISHED
Note: The maximum size of block is 400h. To read more than 400h Bytes, the Host must send a new command.
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4386A–8051–10/04