SAM3S4B Atmel Corporation, SAM3S4B Datasheet - Page 1070
SAM3S4B
Manufacturer Part Number
SAM3S4B
Description
Manufacturer
Atmel Corporation
Specifications of SAM3S4B
Flash (kbytes)
256 Kbytes
Pin Count
64
Max. Operating Frequency
64 MHz
Cpu
Cortex-M3
# Of Touch Channels
23
Hardware Qtouch Acquisition
No
Max I/o Pins
79
Ext Interrupts
79
Usb Transceiver
1
Quadrature Decoder Channels
1
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
10
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)
48
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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41.11.3.1
1070
Master Write Mode
Master Read Mode
Slave Read Mode
Slave Write Mode
SAM3S
Maximum SPI Frequency
Figure 41-16. SPI Slave Mode with (CPOL = NCPHA = 0) or (CPOL= NCPHA= 1)
The following formulas give maximum SPI frequency in Master read and write modes and in
Slave read and write modes.
NPCS0
SPCK
MISO
MOSI
The SPI is only sending data to a slave device such as an LCD, for example. The limit is
given by SPI
speed (see
pad.
T
DataFlash (AT45DB642D), T
In the formula above, F
In slave mode, SPCK is the input clock for the SPI. The max SPCK frequency is given by
setup and hold timings SPI
the pad limit, the limit in slave read mode is given by SPCK pad.
For 3.3V I/O domain and SPI6, F
before sampling data.
f
valid
SPCK
f
SPCK
is the slave time response to output data after detecting an SPCK edge. For Atmel SPI
Max
Max
Section 41.11.2 “I/O
=
2
=
(or SPI
SPI
--------------------------------------------------------
SPI
--------------------------------------------------------------------------------------- -
2x S ( PI
14
0
(
orSPI
5
) timing. Since it gives a maximum frequency above the maximum pad
6max
SPCK
1
3
SPI
(
)
Max = 33.0 MHz @ VDDIO = 3.3V.
7
orSPI
/SPI
+
valid
9
T
1
valid
Characteristics”), the max SPI frequency is the one from the
(or T
8
SPCK
(or SPI
9max
SPI
Max = 25 MHz. T
v
10
) is 12 ns Max.
)
+
10
T
/SPI
setup
11
SPI
)
). Since this gives a frequency well above
11
setup
is the setup time from the master
6500C–ATARM–8-Feb-11
SPI
15
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