AT89C51RE2 Atmel Corporation, AT89C51RE2 Datasheet - Page 67

• 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

Start Application
ISP Command
summary
UART Protocol frames
Table 44. Summary of frames from Host
Address Mapping
7663E–8051–10/08
Command
Program selected memory
Start application with watchdog
Select New Page
Select Memory
Read selected memory
Blank Check selected memory
Erase Selected memory
The start application command is used to quit the bootloader and start the application loaded.
The start application is performed by a watchdog reset.
The best way to start the application from a user defined entry point is to configure the FCB
(Fuse Configuration Byte) before launching the watchdog. Then, depending on the configuration
of the BRV2:0 field, the hardware boots from the selected memory area.
Table 45. Memory Families, Addresses & Coding
Attempting an access with any other ‘coding’, ‘page number’ or ‘Address’ results in no action
and no answer from the bootloader.
Memory/Parameter
Bootloader revision
Record
Type
Product name
00h
01h
02h
04h
Manuf. code
Family code
Product rev
Boot id1
Boot id2
FLASH
HSB
FCB
nb of data
Record
Length
00h
02h
02h
05h
address
address
Offset
0000h
0000h
0000h
start
start
coding
8
3
6
0
7
bits) + 0h
Data[0]
Memory
Page (4
0 up to 0x1FFFF
space
00h
x
x
Start Address
Address
00h
01h
02h
30h
31h
60h
61h
0
0
Data[1]
Page
FFh
00h
x
x
Page number
0 up to 1
Data[2]
00h
0
0
0
0
x
x
x
x
End Address
AT89C51RE2
Data[3]
FLASH
SECURITY
CONFIGURATION
BOOTLOADER
SIGNATURE
Memory/Information
00h
x
x
x
x
Family
Data[4]
00h
01h
02h
x
x
x
x
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