SAM3S2A Atmel Corporation, SAM3S2A Datasheet - Page 84
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SAM3S2A
Manufacturer Part Number
SAM3S2A
Description
Manufacturer
Atmel Corporation
Specifications of SAM3S2A
Flash (kbytes)
128 Kbytes
Pin Count
48
Max. Operating Frequency
64 MHz
Cpu
Cortex-M3
# Of Touch Channels
17
Hardware Qtouch Acquisition
No
Max I/o Pins
47
Ext Interrupts
47
Usb Transceiver
1
Quadrature Decoder Channels
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
2
Twi (i2c)
2
Uart
3
Ssc
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
12
Adc Speed (ksps)
1000
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
Yes
Crypto Engine
No
Sram (kbytes)
32
Self Program Memory
YES
Dram Memory
No
Nand Interface
Yes
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
Yes / No
Timers
3
Output Compare Channels
3
Input Capture Channels
3
Pwm Channels
4
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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SAM3S
PC-relative expressions
Conditional execution
All other load and store instructions generate a usage fault exception if they perform an
unaligned access, and therefore their accesses must be address aligned. For more information
about usage faults see
Unaligned accesses are usually slower than aligned accesses. In addition, some memory
regions might not support unaligned accesses. Therefore, ARM recommends that programmers
ensure that accesses are aligned. To avoid accidental generation of unaligned accesses, use
the UNALIGN_TRP bit in the Configuration and Control Register to trap all unaligned accesses,
see
A PC-relative expression or label is a symbol that represents the address of an instruction or lit-
eral data. It is represented in the instruction as the PC value plus or minus a numeric offset. The
assembler calculates the required offset from the label and the address of the current instruc-
tion. If the offset is too big, the assembler produces an error.
Most data processing instructions can optionally update the condition flags in the Application
Program Status Register (APSR) according to the result of the operation, see
gram Status Register” on page
subset. If a flag is not updated, the original value is preserved. See the instruction descriptions
for the flags they affect.
You can execute an instruction conditionally, based on the condition flags set in another instruc-
tion, either:
Conditional execution is available by using conditional branches or by adding condition code
suffixes to instructions. See
to make them conditional instructions. The condition code suffix enables the processor to test a
condition based on the flags. If the condition test of a conditional instruction fails, the instruction:
Conditional instructions, except for conditional branches, must be inside an If-Then instruction
block. See
Depending on the vendor, the assembler might automatically insert an IT instruction if you have
conditional instructions outside the IT block.
Use the CBZ and CBNZ instructions to compare the value of a register against zero and branch
on the result.
• For B, BL, CBNZ, and CBZ instructions, the value of the PC is the address of the current
• For all other instructions that use labels, the value of the PC is the address of the current
• Your assembler might permit other syntaxes for PC-relative expressions, such as a label plus
• immediately after the instruction that updated the flags
• after any number of intervening instructions that have not updated the flags.
• does not execute
• does not write any value to its destination register
• does not affect any of the flags
• does not generate any exception.
instruction plus 4 bytes.
instruction plus 4 bytes, with bit[1] of the result cleared to 0 to make it word-aligned.
or minus a number, or an expression of the form [PC, #number].
“Configuration and Control Register” on page
“IT” on page 133
“Fault handling” on page
Table 10-16 on page 85
for more information and restrictions when using the IT instruction.
46. Some instructions update all flags, and some only update a
70.
174.
for a list of the suffixes to add to instructions
6500C–ATARM–8-Feb-11
“Application Pro-
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