SAM3N2A Atmel Corporation, SAM3N2A Datasheet - Page 42
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SAM3N2A
Manufacturer Part Number
SAM3N2A
Description
Manufacturer
Atmel Corporation
Specifications of SAM3N2A
Flash (kbytes)
128 Kbytes
Pin Count
48
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
2
Twi (i2c)
2
Uart
3
Ssc
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
384
Resistive Touch Screen
No
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
3
Pwm Channels
4
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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10.4
10.4.1
10.4.1.1
10.4.1.2
10.4.1.3
10.4.1.4
10.4.2
42
Programmers model
SAM3N
Processor mode and privilege levels for software execution
Stacks
Thread mode
Handler mode
Unprivileged
Privileged
This section describes the Cortex-M3 programmers model. In addition to the individual core reg-
ister descriptions, it contains information about the processor modes and privilege levels for
software execution and stacks.
The processor modes are:
Used to execute application software. The processor enters Thread mode when it comes out of
reset.
Used to handle exceptions. The processor returns to Thread mode when it has finished excep-
tion processing.
The privilege levels for software execution are:
The software:
Unprivileged software executes at the unprivileged level.
The software can use all the instructions and has access to all resources.
Privileged software executes at the privileged level.
In Thread mode, the CONTROL register controls whether software execution is privileged or
unprivileged, see
always privileged.
Only privileged software can write to the CONTROL register to change the privilege level for
software execution in Thread mode. Unprivileged software can use the SVC instruction to make
a supervisor call to transfer control to privileged software.
The processor uses a full descending stack. This means the stack pointer indicates the last
stacked item on the stack memory. When the processor pushes a new item onto the stack, it
decrements the stack pointer and then writes the item to the new memory location. The proces-
sor implements two stacks, the main stack and the process stack, with independent copies of
the stack pointer, see
• has limited access to the MSR and MRS instructions, and cannot use the CPS instruction
• cannot access the system timer, NVIC, or system control block
• might have restricted access to memory or peripherals.
“CONTROL register” on page
“Stack Pointer” on page
44.
52. In Handler mode, software execution is
11011A–ATARM–04-Oct-10
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