AT89C51AC3 Atmel Corporation, AT89C51AC3 Datasheet - Page 19

• 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

Start the Application
Requests from Host
Answer from Bootloader No answer is returned by the device.
Example
4386B–8051–03/08
Start application with a reset
Start application with a jump
The flow described below allows to start the application directly from the bootloader upon a spe-
cific command reception.
Two options are possible:
•
•
Command Name
pulse generation
Start the application with a reset pulse generation (using watchdog).
When the device receives this command the watchdog is enabled and the bootloader enters
a waiting loop until the watchdog resets the device.
Take care that if an external reset chip is used the reset pulse in output may be wrong and in
this case the reset sequence is not correctly executed.
Start the application without reset
A jump at the address 0000h is used to start the application without reset.
at “address”
Start Application with reset pulse
Start Application without reset at address 0000h
HOST
BOOTLOADER
HOST
BOOTLOADER
Record
type
03h
: 02 0000 03 03 00 F8
: 02 0000 03 03 00 F8
: 04 0000 03 03 01 00 00 F5
: 04 0000 03 03 01 00 00 F5
Offset
Load
AT89C51AC3 UART Bootloader
x
Record
Length
02h
04h
Data[0]
03h
Data[1]
00h
01h
Data[2]
-
Address
Data[3]
-
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