AT89C51AC2 Atmel Corporation, AT89C51AC2 Datasheet - Page 12

• 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

Read the Flash or
EEPROM Data
Requests from Host
Note:
Answers from
Bootloader
12
Blank check on Flash
Read EEPROM Data
Command Name
Read Flash
The field “Load offset” is not used.
A/T89C51AC2 UART Bootloader
Record
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.
The bootloader answers to a read Flash or EEPROM Data memory command:
•
•
•
The bootloader answers to blank check command:
•
•
•
•
Type
04h
‘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
Load Offset
x
Record
Length
05h
Data[0]
start address
Data[1]
Data[2]
end Address
Data[3]
4231D–CAN–03/08
Data[4]
00h
01h
02h