SAM3N2C Atmel Corporation, SAM3N2C Datasheet - Page 63

• Manufacturer Part Number: SAM3N2C
• Manufacturer: Atmel Corporation

Specifications of SAM3N2C

• Flash (kbytes): 128 Kbytes
• Pin Count: 100
• Max. Operating Frequency: 48 MHz
• Cpu: Cortex-M3
• # Of Touch Channels: 23
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 47
• Ext Interrupts: 47
• Quadrature Decoder Channels: 2
• Usb Speed: No
• Usb Interface: No
• Spi: 3
• Twi (i2c): 2
• Uart: 4
• Ssc: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 16
• Adc Resolution (bits): 10
• Adc Speed (ksps): 384
• Resistive Touch Screen: No
• Dac Channels: 1
• Dac Resolution (bits): 10
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 16
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8/3.3
• Operating Voltage (vcc): 1.62 to 3.6
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 6
• Output Compare Channels: 6
• Input Capture Channels: 6
• Pwm Channels: 4
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

10.5.8
10.6
10.6.1
10.6.1.1
10.6.1.2
10.6.1.3
10.6.1.4
10.6.2
10.6.2.1
11011A–ATARM–04-Oct-10
Exception model
Programming hints for the synchronization primitives
Exception states
Exception types
Inactive
Pending
Active
Active and pending
Reset
ANSI C cannot directly generate the exclusive access instructions. Some C compilers provide
intrinsic functions for generation of these instructions:
Table 10-8.
The actual exclusive access instruction generated depends on the data type of the pointer
passed to the intrinsic function. For example, the following C code generates the require
LDREXB operation:
This section describes the exception model.
Each exception is in one of the following states:
The exception is not active and not pending.
The exception is waiting to be serviced by the processor.
An interrupt request from a peripheral or from software can change the state of the correspond-
ing interrupt to pending.
An exception that is being serviced by the processor but has not completed.
An exception handler can interrupt the execution of another exception handler. In this case both
exceptions are in the active state.
The exception is being serviced by the processor and there is a pending exception from the
same source.
The exception types are:
Reset is invoked on power up or a warm reset. The exception model treats reset as a special
form of exception. When reset is asserted, the operation of the processor stops, potentially at
any point in an instruction. When reset is deasserted, execution restarts from the address pro-
Instruction
LDREX, LDREXH, or
LDREXB
STREX, STREXH, or
STREXB
CLREX
__ldrex((volatile char *) 0xFF);
C compiler intrinsic functions for exclusive access instructions
unsigned int __ldrex(volatile void *ptr)
int __strex(unsigned int val, volatile void *ptr)
Intrinsic function
void __clrex(void)
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