SAM3U4C Atmel Corporation, SAM3U4C Datasheet - Page 461
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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27.4.2
27.4.3
6430E–ATARM–29-Aug-11
3 to 20 MHz Crystal Oscillator
Main Clock Oscillator Selection
this frequency selection, the MOSCRCS bit in the Power Management Controller Status Regis-
ter (PMC_SR) is automatically cleared and MAINCK is stopped until the oscillator is stabilized.
Once the oscillator is stabilized, MAINCK restarts and MOSCRCS is set.
When disabling the Main Clock by clearing the MOSCRCEN bit in CKGR_MOR, the MOSCRCS
bit in the Power Management Controller Status Register (PMC_SR) is automatically cleared,
indicating the Main Clock is off.
Setting the MOSCRCS bit in the Power Management Controller Interrupt Enable Register
(PMC_IER) can trigger an interrupt to the processor.
After reset, the 3 to 20 MHz Crystal Oscillator is disabled and it is not selected as the source of
MAINCK.
The user can select the 3 to 20 MHz crystal oscillator to be the source of MAINCK, as it provides
a more accurate frequency. The software enables or disables the main oscillator so as to reduce
power consumption by clearing the MOSCXTEN bit in the Main Oscillator Register
(CKGR_MOR).
When disabling the main oscillator by clearing the MOSCXTEN bit in CKGR_MOR, the
MOSCXTS bit in PMC_SR is automatically cleared, indicating the Main Clock is off.
When enabling the main oscillator, the user must initiate the main oscillator counter with a value
corresponding to the startup time of the oscillator. This startup time depends on the crystal fre-
quency connected to the oscillator.
When the MOSCXTEN bit and the MOSCXTCNT are written in CKGR_MOR to enable the main
oscillator, the MOSCXTS bit in the Power Management Controller Status Register (PMC_SR) is
cleared and the counter starts counting down on the slow clock divided by 8 from the MOSCX-
TCNT value. Since the MOSCXTCNT value is coded with 8 bits, the maximum startup time is
about 62 ms.
When the counter reaches 0, the MOSCXTS bit is set, indicating that the main clock is valid.
Setting the MOSCXTS bit in PMC_IMR can trigger an interrupt to the processor.
The user can select either the 4/8/12 MHz Fast RC Oscillator or the 3 to 20 MHz Crystal Oscilla-
tor to be the source of Main Clock.
The advantage of the 4/8/12 MHz Fast RC Oscillator is to have fast startup time, this is why it is
selected by default (to start up the system) and when entering in Wait Mode.
The advantage of the 3 to 20 MHz Crystal Oscillator is that it is very accurate.
The selection is made by writing the MOSCSEL bit in the Main Oscillator Register
(CKGR_MOR). The switch of the Main Clock source is glitch free, so there is no need to run out
of SLCK, PLLACK or UPLLCK in order to change the selection. The MOSCSELS bit of the
Power Management Controller Status Register (PMC_SR) allows knowing when the switch
sequence is done.
Setting the MOSCSELS bit in PMC_IMR can trigger an interrupt to the processor.
SAM3U Series
461
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