AT89C51AC2 Atmel Corporation, AT89C51AC2 Datasheet - Page 15

• 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

Program
Configuration
Information
Requests from Host
Answers from
Bootloader
4231D–CAN–03/08
The flow described below allows the user to program Configuration Information regarding the
bootloader functionality.
The Boot Process Configuration:
Note:
The bootloader answers with:
•
•
•
Program SSB level1
Program SSB level2
Command Name
Erase SBV & BSB
Program bit BLJB
–
–
–
–
–
‘.’ & ‘CR’ & ’LF’ when the value is programmed.
‘X’ & ‘CR’ & ‘LF’ if the checksum is wrong.
‘P’ & ‘CR’ & ‘LF’ if the Security is set.
Program bit X2
Program BSB
Program SBV
Program EB
1. The field “Load Offset” is not used
2. To program the BLJB and X2 bit the “bit value” is 00h or 01h.
BSB
SBV
Fuse bits (BLJB and X2 bits) (see Section “Mapping and Default Value of Hardware
Security Byte”)
SSB
EB
Record
Type
03h
A/T89C51AC2 UART Bootloader
Offset
Load
x
Record
Length
02h
02h
03h
03h
Data[0]
0Ah
04h
05h
06h
Data[1]
00h
00h
01h
00h
01h
06h
04h
08h
Data[2]
bit value
value
-
-
-
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