UM2262 Rev 6 55/94
UM2262 Step-by-step execution
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8.4.4 System restart
Pressing the Reset button forces the system to restart: the user application is started by
SBSFU.
Note: Holding the User button during reset, triggers the forced download state instead of the user
application execution.
8.5 User application execution
The user application is executed according to the selection illustrated in Figure 28 and
further described from Section 8.5.1 to Section 8.5.3.
Figure 28. User application execution
8.5.1 Download a new firmware image
The download of a new firmware image is performed through the same steps as those
presented for SBSFU in
Section 8.4 on page 52:
1. Send firmware
– In Te r a Te r m , c l i ck o n File>Transfer>YMODEM>Send
–Select UserApp.sfb (compiled as UserApp#B)
2. The system reboots
3. The Secure Boot state machine handles the new image
– Firmware header is verified
– Firmware is decrypted
– Firmware is installed
– Firmware signature is verified
– Firmware is executed
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