ATSAM3S2AA-MU Atmel, ATSAM3S2AA-MU Datasheet - Page 342
ATSAM3S2AA-MU
Manufacturer Part Number
ATSAM3S2AA-MU
Description
IC MCU 32BIT 128KB FLASH 48QFN
Manufacturer
Atmel
Series
SAM3Sr
Specifications of ATSAM3S2AA-MU
Core Processor
ARM® Cortex-M3™
Core Size
32-Bit
Speed
64MHz
Connectivity
I²C, MMC, SPI, SSC, UART/USART, USB
Peripherals
Brown-out Detect/Reset, DMA, I²S, POR, PWM, WDT
Number Of I /o
34
Program Memory Size
128KB (128K x 8)
Program Memory Type
FLASH
Ram Size
32K x 8
Voltage - Supply (vcc/vdd)
1.62 V ~ 1.95 V
Data Converters
A/D 8x10/12b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
48-VQFN Exposed Pad, 48-HVQFN, 48-SQFN, 48-DHVQFN
Processor Series
ATSAM3x
Core
ARM Cortex M3
3rd Party Development Tools
JTRACE-CM3, MDK-ARM, RL-ARM, ULINK2
Development Tools By Supplier
ATSAM3S-EK
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Details
- Current page: 342 of 1118
- Download datasheet (24Mb)
21.4
342
Device Initialization
SAM3S Preliminary
If a clock is found from the two possible sources above, the boot program checks to verify that
the frequency is one of the supported external frequencies. If the frequency is one of the sup-
ported external frequencies, USB activation is allowed, else (no clock or frequency other than
one of the supported external frequencies), the internal 12 MHz RC oscillator is used as main
clock and USB clock is not allowed due to frequency drift of the 12 MHz RC oscillator.
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 48 MHz clock
10. PLLB setup in case of USB activation allowed
11. Disable of the Watchdog
12. Initialization of UART0 (115200 bauds, 8, N, 1)
13. Initialization of the USB Device Port (in case of USB activation allowed)
14. Wait for one of the following events
15. 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”)
6500C–ATARM–8-Feb-11
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