SAM3U2C Atmel Corporation, SAM3U2C Datasheet - Page 726
SAM3U2C
Manufacturer Part Number
SAM3U2C
Description
Manufacturer
Atmel Corporation
Specifications of SAM3U2C
Flash (kbytes)
128 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)
36
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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35.7.8.2
726
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SAM3U Series
SAM3U Series
Baud Rate
In SPI Mode, the baudrate generator operates in the same way as in USART synchronous
mode:
some restrictions:
In SPI Master Mode:
In SPI Slave Mode:
• the external clock SCK must not be selected (USCLKS ≠ 0x3), and the bit CLKO must be set
• to obtain correct behavior of the receiver and the transmitter, the value programmed in CD
• if the internal clock divided (MCK/DIV) is selected, the value programmed in CD must be
• the external clock (SCK) selection is forced regardless of the value of the USCLKS field in the
• to obtain correct behavior of the receiver and the transmitter, the external clock (SCK)
to “1” in the Mode Register (US_MR), in order to generate correctly the serial clock on the
SCK pin.
must be superior or equal to 6.
even to ensure a 50:50 mark/space ratio on the SCK pin, this value can be odd if the internal
clock is selected (MCK).
Mode Register (US_MR). Likewise, the value written in US_BRGR has no effect, because
the clock is provided directly by the signal on the USART SCK pin.
frequency must be at least 6 times lower than the system clock.
See “Baud Rate in Synchronous Mode or SPI Mode” on page 698.
However, there are
6430E–ATARM–29-Aug-11
6430E–ATARM–29-Aug-11
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