AT89C51AC2 Atmel Corporation, AT89C51AC2 Datasheet - Page 7

• 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

4. Boot Process Compatibility
4159G–8051–05/06
Workaround
A ‘Special Sync’ can be used with ‘FLIP’ software.
In this case, the open port event and the ‘U’ sent are dissociated. The user must first open his COM port with the ‘con-
nect’ button, then reset its hardware and finally push the ‘sync’ button.
There are some differences between Boot process of bootloader 1.2 and newer versions.
Version 1.2:
Version 1.4:
Workaround
Use the fuse bit BLJB to start the application on both versions.
Application
Executed
Application
Executed
BLJB = 1
BLJB = 1
User Bootloader
Yes
User Bootloader
Executed
Executed
BSB = 00h
RESET
RESET
BLJB
Yes
BLJB
No
No
No
No
FCON = F0h
FCON = F0h
BLJB = 0
SBV = FCh
BLJB = 0
SBV < FCh
Hardware Process
Hardware Process
Software Process
Software Process
Yes
No
Yes
Yes
Atmel bootloader
Atmel bootloader
Executed
Executed
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