SAM3S8B Atmel Corporation, SAM3S8B Datasheet - Page 354

• Manufacturer Part Number: SAM3S8B
• Manufacturer: Atmel Corporation

21.4
354
354
Device Initialization
SAM3S8/SD8
SAM3S8/SD8
Initialization follows the steps described below:
1. Stack setup
2. Setup the Embedded Flash Controller
3. External Clock detection (crystal or external clock on XIN)
4. If external crystal or clock with supported frequency, allow USB activation
5. Else, does not allow USB activation and use internal 12 MHz RC oscillator
6. Main oscillator frequency detection if no external clock detected
7. Switch Master Clock on Main Oscillator
8. C variable initialization
9. PLLA setup: PLLA is initialized to generate a 96 MHz clock
10. Switch Master Clock on PLLA/2
11. Initialization of UART0 (115200 bauds, 8, N, 1)
12. Initialization of the USB Device Port (in case USB activation allowed)
13. Wait for one of the following events
14. Jump to SAM-BA Monitor (see
a. check if USB device enumeration has occurred
b. check if characters have been received in UART0
Section 21.5 ”SAM-BA
Monitor”)
11090A–ATARM–10-Feb-12
11090A–ATARM–10-Feb-12