at89c51snd1 ATMEL Corporation, at89c51snd1 Datasheet - Page 16

• Manufacturer Part Number: at89c51snd1
• Description: Mp3 Microcontrollers
• Manufacturer: ATMEL Corporation

Read Configuration
Information or Manufacturer
Information
Requests from Host
Answers from Bootloader
Figure 10. Read Command
16
AT89C51SND1 UART Bootloader
COMMAND FINISHED
Wait Value of Data
Send Read Command
OR
Host
OR
COMMAND ABORTED
COMMAND ABORTED
Wait Checksum Error
Wait Security Error
The flow described in Figure 10 allows the user to read the configuration or manufac-
turer information.
Note:
The bootloader answers with:
•
•
•
Command Name
Read Manufacturer Code
Read Family Code
Read Product Name
Read Product Revision
Read SSB
Read BSB
Read SBV
Read HSB (Fuse bit)
Read Device ID1
Read Device ID2
Read bootloader version
“value” & “.” & “CR” & “LF” when the value is programmed
“X” & “CR” & “LF” if the checksum is wrong
“P” & “CR” & “LF” if the Security is set
The field “Load Offset” is not used.
“value” & “.” & CR & LF
Read Command
“X” & CR & LF
“L” & CR & LF
Record
Type
05h
Send Checksum Error
Send Security Error
Offset
Load
x
Bootloader
Record
Length
Wait Read Command
02h
RD_WR_SECURITY
Send Data Read
Checksum Error
Read Value
Data[0]
00h
07h
0Bh
0Eh
0Fh
4241B–MP3–07/04
Data[1]
00h
01h
02h
03h
00h
01h
02h
00h
00h
01h
00h