AT89C51AC3 Atmel Corporation, AT89C51AC3 Datasheet - Page 11

• Manufacturer Part Number: AT89C51AC3
• Manufacturer: Atmel Corporation

Specifications of AT89C51AC3

• Flash (kbytes): 64 Kbytes
• Max. Operating Frequency: 60 MHz
• Cpu: 8051-12C
• Max I/o Pins: 32
• Spi: 1
• Uart: 1
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 62.5
• Sram (kbytes): 2.25
• Eeprom (bytes): 2048
• Self Program Memory: API
• Operating Voltage (vcc): 3.0 to 5.5
• Timers: 4
• Isp: UART
• Watchdog: Yes

Read the Flash or
EEPROM Data
Requests from Host
Answers from
Bootloader
Flow Description: Blank
Check Command
4386B–8051–03/08
COMMAND FINISHED
Wait Address not
Send Blank Check Command
erased
OR
Host
OR
COMMAND ABORTED
Wait Checksum Error
COMMAND FINISHED
Wait COMMAND_OK
The flow described below allows the user to read data in the Flash memory or in the EEPROM
data memory. A blank check command is possible with this flow.
The device splits into blocks of 16 bytes the data to transfer to the Host if the number of data to
display is greater than 16 data bytes.
Note:
The bootloader answers to a read Flash or EEPROM Data memory command:
•
•
•
The bootloader answers to blank check command:
•
•
•
•
‘Address = data ‘ & ‘CR’ & ’LF’
up to 16 data by line.
‘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
‘P’ & ‘CR’ & ‘LF’ if the Security is set
The field “Load offset” is not used.
Command Name
Read EEPROM
Blank check on
Read Flash
Flash
Data
Blank Check Command
address & CR & LF
’X’ & CR & LF
’.’ & CR & LF
Record
Type
04h
AT89C51AC3 UART Bootloader
Offset
Load
x
Record
Length
05h
Send COMMAND_OK
Send Checksum error
Data[0]
start address
Wait Blank Check Command
Bootloader
Data[1]
Send first Address
not erased
Checksum error
Flash blank
Data[2]
end Address
Data[3]
Data[4]
00h
01h
02h
11