1. Atsam4c-ek user guide.
http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel_11251_SmartEnergy_ATSAM4C-EK-User_Guide_SAM4C8-SAM4C16_User-Guide.pdf
2. Cortex-m4 technical reference manual.
http://infocenter.arm.com/help/topic/com.arm.doc.ddi0439b/DDI0439B_cortex_m4_r0p0_trm.pdf
3. Lecture Notes in Computer Science;A Bauer,2013
4. Lecture Notes in Computer Science;A Bauer,2014
5. Lecture Notes in Computer Science;S Chari,2003