AT89C51AC2 Atmel Corporation, AT89C51AC2 Datasheet - Page 11

• Manufacturer Part Number: AT89C51AC2
• Manufacturer: Atmel Corporation

Specifications of AT89C51AC2

• Flash (kbytes): 32 Kbytes
• Max. Operating Frequency: 40 MHz
• Cpu: 8051-12C
• Max I/o Pins: 34
• Uart: 1
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 62.5
• Sram (kbytes): 1.25
• Eeprom (bytes): 2048
• Self Program Memory: API
• Operating Voltage (vcc): 3.0 to 5.5
• Timers: 4
• Isp: UART
• Watchdog: Yes

Programming the
Flash or EEPROM
Data
Requests from Host
Answers from
Bootloader
Flow Description
Example
4231D–CAN–03/08
COMMAND FINISHED
Wait COMMAND_OK
Send Write Command
OR
Host
OR
COMMAND ABORTED
Wait Checksum Error
COMMAND ABORTED
Wait Security Error
The flow described below shows how to program data in the Flash memory or in the EEPROM
data memory.
The bootloader programs on a page of 128 bytes basis when it is possible.
The host must take care that:
•
The bootloader answers with:
•
•
•
The data to program transmitted within a frame are in the same page.
‘.’ & ‘CR’ & ’LF’ when the data are programmed
‘X’ & ‘CR’ & ‘LF’ if the checksum is wrong
‘P’ & ‘CR’ & ‘LF’ if the Security is set
Programming Data (write 55h at address 0010h in the Flash)
HOST
BOOTLOADER
Program EEPROM
Command Name
Program Flash
Data
’X’ & CR & LF
Write Command
’P’ & CR & LF
’.’ & CR & LF
: 01 0010 00 55 9A
: 01 0010 00 55 9A . CR LF
A/T89C51AC2 UART Bootloader
Record
Type
00h
07h
address
address
Offset
Load
start
start
Send Checksum error
Send Security error
nb of Data
nb of Data
Record
Length
Bootloader
Wait Write Command
Send COMMAND_OK
Wait Programming
Data[0]
Checksum error
NO_SECURITY
x
x
...
...
...
Data[127]
x
x
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