AT91SAM9G46B-CU 查看數據表（PDF） - Atmel Corporation
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AT91SAM9G46B-CU Datasheet PDF : 1277 Pages
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10.5
SAM-BA Monitor
If no valid code has been found in NVM during the NVM bootloader sequence, the SAM-BA Monitor program is
launched.
The SAM-BA Monitor principle is to:
̶ Initialize DBGU and USB
̶ Check if USB Device enumeration has occurred.
̶ Check if characters have been received on the DBGU.
̶ Once the communication interface is identified, the application runs in an infinite loop waiting for
different commands as listed in Table 10-5 on page 70.
Figure 10-8. SAM-BA Monitor Diagram
No valid code in NVM
Init DBGU and USB
USB Enumerat ion
Successful ?
Yes
Run monitor
Wait for command
on the USBlink
No
No
Character(s) received
on DBGU ?
Yes
Run monitor
Wait for command
on the DBGU link
SAM9G46 Series [DATASHEET]
69
Atmel-11028G-ATARM-SAM9G46-Datasheet_08-Dec-15
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