at89c51snd1 ATMEL Corporation, at89c51snd1 Datasheet - Page 19

• Manufacturer Part Number: at89c51snd1
• Description: Mp3 Microcontrollers
• Manufacturer: ATMEL Corporation

Start the Application
Requests from Host
Answer from Bootloader
Start Application Example
4241B–MP3–07/04
The command described below allows to start the application directly from the boot-
loader upon a specific command reception.
Two options are possible:
•
•
No answer is returned by the device.
Start Application with reset pulse
Start Application without reset at address 0000h
Command Name
Start application with a
reset pulse generation
Start application with a
jump at “address”
HOST
BOOTLOADER
HOST
BOOTLOADER
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.
: 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
AT89C51SND1 UART Bootloader
Record
Type
03h
Offset
Load
x
Record
Length
02h
04h
Data[0]
03h
Data[1]
00h
01h
Data[2]
Address
Data[3]
19