Datasheet

106
4235K–8051–05/08
AT89C51RD2/ED2
24.9.5 Write/Program Commands Description
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
Figure 24-9. Write/Program Flow
Host
Bootloader
Write Command
’X’ & CR & LF
NO_SECURITY
Wait Write Command
Checksum Error
Wait Programming
Send Security Error
Send COMMAND_OK
Send Write Command
Wait Checksum Error
Wait COMMAND_OK
Wait Security Error
OR
COMMAND ABORTED
COMMAND FINISHED
Send Checksum Error
COMMAND ABORTED
’P’ & CR & LF
OR
’.’ & CR & LF