AT89C51RD2 Atmel Corporation, AT89C51RD2 Datasheet - Page 107

• Manufacturer Part Number: AT89C51RD2
• Manufacturer: Atmel Corporation

Specifications of AT89C51RD2

• Flash (kbytes): 64 Kbytes
• Max. Operating Frequency: 60 MHz
• Cpu: 8051-12C
• Max I/o Pins: 32
• Spi: 1
• Uart: 1
• Sram (kbytes): 2
• Self Program Memory: API
• Operating Voltage (vcc): 2.7 to 5.5
• Timers: 4
• Isp: UART
• Watchdog: Yes

24.9.5.1
24.9.6
Figure 24-10. Blank Check Flow
4235K–8051–05/08
COMMAND FINISHED
Blank Check Command Description
Wait Address not
Example
Send Blank Check Command
Erased
Programming Data (write 55h at address 0010h in the Flash)
Programming Atmel function (write SSB to level 2)
Writing Frame (write BSB to 55h)
HOST
BOOTLOADER
HOST
BOOTLOADER
HOST
BOOTLOADER
OR
Host
OR
COMMAND ABORTED
Wait Checksum Error
COMMAND FINISHED
Wait COMMAND_OK
: 01 0010 00 55 9A
: 01 0010 00 55 9A . CR LF
: 02 0000 03 05 01 F5
: 02 0000 03 05 01 F5. CR LF
: 03 0000 03 06 00 55 9F
: 03 0000 03 06 00 55 9F . CR LF
Blank Check Command
address & CR & LF
’X’ & CR & LF
’.’ & CR & LF
Send COMMAND_OK
Send Checksum Error
Wait Blank Check Command
Bootloader
AT89C51RD2/ED2
Send First Address
not Erased
Checksum Error
Flash Blank
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