ATSAM3U4CA-CU Atmel, ATSAM3U4CA-CU Datasheet - Page 466

• Manufacturer Part Number: ATSAM3U4CA-CU
• Description: IC MCU 32BIT 256KB FLSH 100TFBGA
• Manufacturer: Atmel
• Series: SAM3Ur

Specifications of ATSAM3U4CA-CU

• Core Processor: ARM® Cortex-M3™
• Core Size: 32-Bit
• Speed: 96MHz
• Connectivity: EBI/EMI, I²C, MMC, SPI, SSC, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, DMA, I²S, POR, PWM, WDT
• Number Of I /o: 57
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 52K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 1.95 V
• Data Converters: A/D 4x10b, 4x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-TFBGA
• Processor Series: ATSAM3x
• Core: ARM Cortex M3
• Data Bus Width: 32 bit
• Data Ram Size: 52 KB
• Interface Type: 3xUSART, TWI, 4xSPI, Bus
• Maximum Clock Frequency: 96 MHz
• Number Of Programmable I/os: 57
• Number Of Timers: 8
• Operating Supply Voltage: 1.62 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: JTRACE-CM3, MDK-ARM, RL-ARM, ULINK2
• Development Tools By Supplier: ATSAM3U-EK
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

28.10 Clock Failure Detector
The clock failure detector allows to monitor the 3 to 20 MHz Crystal Oscillator and to detect an
eventual defect of this oscillator (for example if the crystal is disconnected).
The clock failure detector can be enabled or disabled by means of the CFDEN bit in the PMC
Clock Generator Main Oscillator Register (CKGR_MOR). After reset, the detector is disabled.
However, if the 3 to 20 MHz Crystal Oscillator is disabled, the clock failure detector is disabled
too.
A failure is detected by means of a counter incrementing on the 3 to 20 MHzCrystal oscillator or
Ceramic Resonator-based oscillator clock edge and timing logic clocked on the slow clock RC
oscillator controlling the counter. The counter is cleared when the slow clock RC oscillator signal
is low and enabled when the slow clock RC oscillator is high. Thus the failure detection time is 1
slow clock RC oscillator clock period. If, during the high level period of slow clock RC oscillator,
less than 8 fast crystal clock periods have been counted, then a failure is declared.
If a failure of the 3 to 20 MHz Crystal Oscillator clock is detected, the CFDEV flag is set in the
PMC Status Register (PMC_SR), and can generate an interrupt if it is not masked. The interrupt
remains active until a read operation in the PMC_SR register. The user can know the status of
the clock failure detector at any time by reading the CFDS bit in the PMC_SR register.
If the 3 to 20 MHz Crystal Oscillator clock is selected as the source clock of MAINCK (MOSC-
SEL = 1), and if the Master Clock Source is PLLACK or UPLLCK (CSS = 2 or 3), then a clock
failure detection switches automatically the Master Clock on MAINCK. Then whatever the PMC
configuration is, a clock failure detection switches automatically MAINCK on the 4/8/12 MHz
Fast RC Oscillator clock. If the Fast RC Oscillator is disabled when a clock failure detection
occurs, it is automatically re-enabled by the clock failure detection mechanism.
A clock failure detection activates a fault output that is connected to the Pulse Width Modulator
(PWM) Controller. With this connection, the PWM controller is able to force its outputs and to
protect the driven device, if a clock failure is detected. This fault output remains active until the
defect is detected and until it is not cleared by the bit FOCLR in the PMC Fault Output Clear
Register (PMC_FOCR).
It takes 2 slow clock RC oscillator cycles to detect and switch from the 3 to 20 MHz Crystal or
Ceramic Resonator-based oscillator to the 4/8/12 MHz Fast RC Oscillator if the Master Clock
source is Main Clock, or 3 slow clock RC oscillator cycles if the Master Clock source is PLL.
The user can know the status of the fault output at any time by reading the FOS bit in the
PMC_SR register.
SAM3U Series
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6430D–ATARM–25-Mar-11