ATSAM3S4CA-AU Atmel, ATSAM3S4CA-AU Datasheet - Page 342

• Manufacturer Part Number: ATSAM3S4CA-AU
• Description: IC MCU 32BIT 256KB FLASH 100LQFP
• Manufacturer: Atmel
• Series: SAM3Sr

Specifications of ATSAM3S4CA-AU

• Core Processor: ARM® Cortex-M3™
• Core Size: 32-Bit
• Speed: 64MHz
• Connectivity: EBI/EMI, I²C, MMC, SPI, SSC, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, DMA, I²S, POR, PWM, WDT
• Number Of I /o: 79
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 48K x 8
• Voltage - Supply (vcc/vdd): 1.62 V ~ 1.95 V
• Data Converters: A/D 16x10/12b, D/A 2x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-LQFP
• Controller Family/series: ATSAM3S
• No. Of I/o's: 79
• Ram Memory Size: 48KB
• Cpu Speed: 64MHz
• No. Of Timers: 6
• Rohs Compliant: Yes
• Processor Series: ATSAM3x
• Core: ARM Cortex M3
• 3rd Party Development Tools: JTRACE-CM3, MDK-ARM, RL-ARM, ULINK2
• Development Tools By Supplier: ATSAM3S-EK
• Cpu Family: AT91
• Device Core: ARM Cortex-M3
• Device Core Size: 32b
• Frequency (max): 64MHz
• Total Internal Ram Size: 48KB
• # I/os (max): 79
• Number Of Timers - General Purpose: 6
• Operating Supply Voltage (typ): 1.8/3.3V
• Operating Supply Voltage (max): 1.95/3.6V
• Operating Supply Voltage (min): 1.62V
• On-chip Adc: 16-chx12-bit
• On-chip Dac: 2-chx12-bit
• Instruction Set Architecture: RISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 100
• Package Type: LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

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