Datasheet

19
4266C–CAN–03/08
AT89C51CC03 UART Bootloader
Start the Application The flow described below allows to start the application directly from the bootloader upon a spe-
cific command reception.
Two options are possible:
• 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.
Requests from Host
Answer from Bootloader No answer is returned by the device.
Example
Command Name
Record
type
Load
Offset
Record
Length Data[0] Data[1] Data[2] Data[3]
Start application with a reset
pulse generation
03h x
02h
03h
00h - -
Start application with a jump
at “address”
04h 01h Address
HOST : 02 0000 03 03 00 F8
BOOTLOADER : 02 0000 03 03 00 F8
Start Application with reset pulse
HOST : 04 0000 03 03 01 00 00 F5
BOOTLOADER : 04 0000 03 03 01 00 00 F5
Start Application without reset at address 0000h