AT89C51RE2 Atmel Corporation, AT89C51RE2 Datasheet - Page 60

• 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

Programming/Erasing
memory
Requests from Host
Answers from
Bootloader
Starting application
Requests from Host
60
AT89C51RE2
The boot loader answers with:
•
•
•
The application can only be started by a Watchdog reset.
No answer is returned by the bootloader.
Command
Program selected memory
Erase selected memory
Command
Start application with watchdog
‘.’ & ‘CR’ &’LF’ when the data are programmed
‘X’ & ‘CR’ & ‘LF’ if the checksum is wrong
‘P’ & ‘CR’ & ‘LF’ if the Security is set
Record
Type
00h
04h
Record
Length
nb of
data
05h
address
Offset
0000h
start
Record Type
Data[0]
01h
00h
x
Data[1]
FFh
x
Record
Length
00h
Data[2]
00h
x
Data[3]
00h
7663E–8051–10/08
x
Offset
0000h
Data[4]
02h
x