SAM3S2C Atmel Corporation, SAM3S2C Datasheet - Page 584
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SAM3S2C
Manufacturer Part Number
SAM3S2C
Description
Manufacturer
Atmel Corporation
Specifications of SAM3S2C
Flash (kbytes)
128 Kbytes
Pin Count
100
Max. Operating Frequency
64 MHz
Cpu
Cortex-M3
# Of Touch Channels
39
Hardware Qtouch Acquisition
No
Max I/o Pins
47
Ext Interrupts
47
Usb Transceiver
1
Quadrature Decoder Channels
2
Usb Speed
Full Speed
Usb Interface
Device
Spi
3
Twi (i2c)
2
Uart
4
Ssc
1
Sd / Emmc
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
16
Adc Resolution (bits)
12
Adc Speed (ksps)
1000
Analog Comparators
1
Resistive Touch Screen
No
Dac Channels
2
Dac Resolution (bits)
12
Temp. Sensor
Yes
Crypto Engine
No
Sram (kbytes)
32
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
6
Output Compare Channels
6
Input Capture Channels
6
Pwm Channels
4
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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30.6.3
30.7
30.7.1
30.7.2
Table 30-4.
584
584
SPI Mode
Functional Description
SAM3S
SAM3S
0
1
2
3
Interrupt
Modes of Operation
Data Transfer
SPI Bus Protocol Mode
CPOL
The SPI interface has an interrupt line connected to the Nested Vector Interrupt Controller
(NVIC).Handling the SPI interrupt requires programming the NVIC before configuring the SPI.
Table 30-3.
The SPI operates in Master Mode or in Slave Mode.
Operation in Master Mode is programmed by writing at 1 the MSTR bit in the Mode Register.
The pins NPCS0 to NPCS3 are all configured as outputs, the SPCK pin is driven, the MISO line
is wired on the receiver input and the MOSI line driven as an output by the transmitter.
If the MSTR bit is written at 0, the SPI operates in Slave Mode. The MISO line is driven by the
transmitter output, the MOSI line is wired on the receiver input, the SPCK pin is driven by the
transmitter to synchronize the receiver. The NPCS0 pin becomes an input, and is used as a
Slave Select signal (NSS). The pins NPCS1 to NPCS3 are not driven and can be used for other
purposes.
The data transfers are identically programmable for both modes of operations. The baud rate
generator is activated only in Master Mode.
Four combinations of polarity and phase are available for data transfers. The clock polarity is
programmed with the CPOL bit in the Chip Select Register. The clock phase is programmed with
the NCPHA bit. These two parameters determine the edges of the clock signal on which data is
driven and sampled. Each of the two parameters has two possible states, resulting in four possi-
ble combinations that are incompatible with one another. Thus, a master/slave pair must use the
same parameter pair values to communicate. If multiple slaves are used and fixed in different
configurations, the master must reconfigure itself each time it needs to communicate with a dif-
ferent slave.
Table 30-4
Figure 30-3
0
0
1
1
Instance
SPI
NCPHA
shows the four modes and corresponding parameter settings.
and
1
0
1
0
Peripheral IDs
Figure 30-4
Shift SPCK Edge
21
ID
show examples of data transfers.
Falling
Rising
Rising
Falling
Capture SPCK Edge
Rising
Falling
Falling
Rising
SPCK Inactive Level
6500C–ATARM–8-Feb-11
6500C–ATARM–8-Feb-11
High
High
Low
Low
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