SAM3S4B Atmel Corporation, SAM3S4B Datasheet - Page 942
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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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37.6.3.6
37.6.3.7
37.6.3.8
942
SAM3S
Entering in Suspend State
Receiving a Host Resume
Sending a Device Remote Wakeup
When a Suspend (no bus activity on the USB bus) is detected, the RXSUSP signal in the
UDP_ISR register is set. This triggers an interrupt if the corresponding bit is set in the UDP_IMR
register.This flag is cleared by writing to the UDP_ICR register. Then the device enters Suspend
Mode.
In this state bus powered devices must drain less than 500uA from the 5V VBUS. As an exam-
ple, the microcontroller switches to slow clock, disables the PLL and main oscillator, and goes
into Idle Mode. It may also switch off other devices on the board.
The USB device peripheral clocks can be switched off. Resume event is asynchronously
detected. MCK and UDPCK can be switched off in the Power Management controller and the
USB transceiver can be disabled by setting the TXVDIS field in the UDP_TXVC register.
Warning: Read, write operations to the UDP registers are allowed only if MCK is enabled for the
UDP peripheral. Switching off MCK for the UDP peripheral must be one of the last operations
after writing to the UDP_TXVC and acknowledging the RXSUSP.
In suspend mode, a resume event on the USB bus line is detected asynchronously, transceiver
and clocks are disabled (however the pull-up shall not be removed).
Once the resume is detected on the bus, the WAKEUP signal in the UDP_ISR is set. It may gen-
erate an interrupt if the corresponding bit in the UDP_IMR register is set. This interrupt may be
used to wake up the core, enable PLL and main oscillators and configure clocks.
Warning: Read, write operations to the UDP registers are allowed only if MCK is enabled for the
UDP peripheral. MCK for the UDP must be enabled before clearing the WAKEUP bit in the
UDP_ICR register and clearing TXVDIS in the UDP_TXVC register.
In Suspend state it is possible to wake up the host sending an external resume.
Before sending a K state to the host, MCK, UDPCK and the transceiver must be enabled. Then
to enable the remote wakeup feature, the RMWUPE bit in the UDP_GLB_STAT register must be
enabled. To force the K state on the line, a transition of the ESR bit from 0 to 1 has to be done in
the UDP_GLB_STAT register. This transition must be accomplished by first writing a 0 in the
ESR bit and then writing a 1.
The K state is automatically generated and released according to the USB 2.0 specification.
• The device must wait at least 5 ms after being entered in suspend before sending an external
• The device has 10 ms from the moment it starts to drain current and it forces a K state to
• The device must force a K state from 1 to 15 ms to resume the host
resume.
resume the host.
6500C–ATARM–8-Feb-11
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