SAM3U4C Atmel Corporation, SAM3U4C Datasheet - Page 62
SAM3U4C
Manufacturer Part Number
SAM3U4C
Description
Manufacturer
Atmel Corporation
Specifications of SAM3U4C
Flash (kbytes)
256 Kbytes
Pin Count
100
Max. Operating Frequency
96 MHz
Cpu
Cortex-M3
# Of Touch Channels
28
Hardware Qtouch Acquisition
No
Max I/o Pins
57
Ext Interrupts
57
Usb Transceiver
1
Quadrature Decoder Channels
1
Usb Speed
Hi-Speed
Usb Interface
Device
Spi
4
Twi (i2c)
1
Uart
4
Ssc
1
Sd / Emmc
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
12
Adc Speed (ksps)
384
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
50
Self Program Memory
YES
External Bus Interface
1
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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13.3.3.8
• ICI
Interruptible-continuable instruction bits, see
• IT
Indicates the execution state bits of the
• T
Always set to 1.
13.3.3.9
13.3.3.10
13.3.3.11
62
SAM3U Series
Execution Program Status Register
Interruptible-continuable instructions
If-Then block
Exception mask registers
The EPSR contains the Thumb state bit, and the execution state bits for either the:
See the register summary in
ments are:
Attempts to read the EPSR directly through application software using the MSR instruction
always return zero. Attempts to write the EPSR using the MSR instruction in application software
are ignored. Fault handlers can examine EPSR value in the stacked PSR to indicate the opera-
tion that is at fault. See
When an interrupt occurs during the execution of an LDM or STM instruction, the processor:
After servicing the interrupt, the processor:
When the EPSR holds ICI execution state, bits[26:25,11:10] are zero.
The If-Then block contains up to four instructions following a 16-bit IT instruction. Each instruc-
tion in the block is conditional. The conditions for the instructions are either all the same, or
some can be the inverse of others. See
The exception mask registers disable the handling of exceptions by the processor. Disable
exceptions where they might impact on timing critical tasks.
To access the exception mask registers use the MSR and MRS instructions, or the CPS instruc-
tion to change the value of PRIMASK or FAULTMASK. See
158, and
• If-Then (IT) instruction
• Interruptible-Continuable Instruction (ICI) field for an interrupted load multiple or store
• stops the load multiple or store multiple instruction operation temporarily
• stores the next register operand in the multiple operation to EPSR bits[15:12].
• returns to the register pointed to by bits[15:12]
• resumes execution of the multiple load or store instruction.
multiple instruction.
“CPS” on page 153
IT
instruction, see
“Interruptible-continuable instructions” on page
“Exception entry and return” on page 82
for more information.
Table 13-2 on page 57
“IT” on page
“IT” on page 147
147.
for the EPSR attributes. The bit assign-
for more information.
“MRS” on page
62.
157,
6430E–ATARM–29-Aug-11
“MSR” on page
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