ATSAM3U4CA-CU Atmel, ATSAM3U4CA-CU Datasheet - Page 236

• 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

14.4.6
14.4.6.1
236
SAM3U Series
ITM (Instrumentation Trace Macrocell)
How to Configure the ITM
The DWT contains counters for the items that follow:
The ITM is an application driven trace source that supports printf style debugging to trace Oper-
ating System (OS) and application events, and emits diagnostic system information. The ITM
emits trace information as packets which can be generated by three different sources with sev-
eral priority levels:
The following example describes how to output trace data in asynchronous trace mode.
• Watchpoint event to halt core
• Clock cycle (CYCCNT)
• Folded instructions
• Load Store Unit (LSU) operations
• Sleep Cycles
• CPI (all instruction cycles except for the first cycle)
• Interrupt overhead
• Software trace: Software can write directly to ITM stimulus registers. This can be done
• Hardware trace: The ITM emits packets generated by the DWT.
• Time stamping: Timestamps are emitted relative to packets. The ITM contains a 21-bit
• Configure the TPIU for asynchronous trace mode (refer to
• Enable the write accesses into the ITM registers by writing “0xC5ACCE55” into the
• Write 0x00010015 into the Trace Control Register:
• Write 0x1 into the Trace Enable Register:
• Write 0x1 into the Trace Privilege Register:
• Write into the Stimulus port 0 register: TPIU (Trace Port Interface Unit)
thanks to the “printf” function. For more information, refer to
Configure the
counter to generate the timestamp.
Configure the
Lock Access Register (Address: 0xE0000FB0)
The TPIU acts as a bridge between the on-chip trace data and the Instruction Trace Macro-
cell (ITM).
The TPIU formats and transmits trace data off-chip at frequencies asynchronous to the core.
– Enable ITM
– Enable Synchronization packets
– Enable SWO behavior
– Fix the ATB ID to 1
– Enable the Stimulus port 0
– Stimulus port 0 only accessed in privileged mode (Clearing a bit in this register will
result in the corresponding stimulus port being accessible in user mode.)
ITM”.
TPIU”)
Section 14.4.6.3 “5.4.3. How to
Section 14.4.6.1 “How to
6430D–ATARM–25-Mar-11