AT89C51RE2 Atmel Corporation, AT89C51RE2 Datasheet - Page 59

• Manufacturer Part Number: AT89C51RE2
• Manufacturer: Atmel Corporation

Specifications of AT89C51RE2

• Flash (kbytes): 128 Kbytes
• Max. Operating Frequency: 60 MHz
• Cpu: 8051-12C
• Max I/o Pins: 34
• Spi: 1
• Uart: 2
• Sram (kbytes): 8.25
• Self Program Memory: API
• Operating Voltage (vcc): 2.7 to 5.5
• Timers: 4
• Isp: UART/OCD
• Watchdog: Yes

Reading/Blank
checking memory
Requests from Host
Answers from
Bootloader
Changing
memory/page
Requests from Host
Answers from
Bootloader
7663E–8051–10/08
To start the reading or blank checking operation,
The boot loader can answer to a read command with:
•
•
•
The bootloader answers to blank check command:
•
•
•
•
To change the memory selected and/or the page, the Host can send two commands.
•
•
The boot loader can answer to a read command with:
•
•
Command
Read selected memory
Blank Check selected memory
Command
Select New Page
Select Memory
‘Address = data ‘& ‘CR’ &’LF’ the number of data by line depends of the bootloader.
‘X’ & ‘CR’ & ‘LF’ if the checksum is wrong
‘L’ & ‘CR’ & ‘LF’ if the Security is set
‘.’ & ‘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
‘L’ & ‘CR’ & ‘LF’ if the Security is set
Select New Page to keep the same memory.
Select Memory to change the Memory and page
‘. ‘& ‘CR’ &’LF’ if the command is done
‘X’ & ‘CR’ & ‘LF’ if the checksum is wrong
Record
Type
04h
Record
Length
05h
Record
Type
02h
04h
Offset
0000h
Record
Length
02h
02h
Data[0]
Start Address
Data[1]
address
Offset
0000h
start
AT89C51RE2
Data[2]
End Address
bits) + 0h
Data[0]
Memory
Page (4
space
Data[3]
Data[1]
Page
Data[4]
00h
00h
01h
59