Datasheet

11
4266C–CAN–03/08
AT89C51CC03 UART Bootloader
Read the Flash or
EEPROM Data
The flow described below allows the user to read data in the Flash memory or in the EEPROM
data memory. A blank check command is possible with this flow.
The device splits into blocks of 16 bytes the data to transfer to the Host if the number of data to
display is greater than 16 data bytes.
Requests from Host
Note: The field “Load offset” is not used.
Answers from
Bootloader
The bootloader answers to a read Flash or EEPROM Data memory command:
• ‘Address = data ‘ & ‘CR’ & ’LF’
up to 16 data by line.
• ‘X’ & ‘CR’ & ‘LF’ if the checksum is wrong
• ‘L’ & ‘CR’ & ‘LF’ if the Security is set
The bootloader answers to blank check command:
• ‘.’ & ‘CR’ & ’LF’ when the blank check is ok
• ‘First Address wrong’ ‘CR’ & ‘LF’ when the blank check is fail
• ‘X’ & ‘CR’ & ‘LF’ if the checksum is wrong
• ‘P’ & ‘CR’ & ‘LF’ if the Security is set
Flow Description: Blank
Check Command
Command Name
Record
Type
Load
Offset
Record
Length Data[0] Data[1] Data[2] Data[3] Data[4]
Read Flash
04h x 05h start address end Address
00h
Blank check on
Flash
01h
Read EEPROM
Data
02h
Host
Bootloader
Blank Check Command
’X’ & CR & LF
Flash blank
Wait Blank Check Command
Send first Address
Send COMMAND_OK
Send Blank Check Command
Wait Checksum Error
Wait Address not
erased
Wait COMMAND_OK
OR
COMMAND ABORTED
COMMAND FINISHED
Send Checksum error
COMMAND FINISHED
’.’ & CR & LF
OR
address & CR & LF
not erased
Checksum error