Clive Turvey (Clive1) master of the ST Forums, talks with us about ARM cores and answering difficult technical questions for fun. Some answers: NVIC Interrupts on the same pin number STM32F4 PWM channel 3 ST's Cortex-M7 Books (though we talked more about these being good authors, these are the ones Chris and Elecia have or want): The Definitive Guide to ARM Cortex-M3 and Cortex-M4 Processors, 3rd Edition (Joseph Yiu, 2013) The Definitive Guide to ARM Cortex-M0 and Cortex-M0+ Processors, 2nd Edition (Joseph Yiu, 2015) Z80 Assembly Language Programming Paperback (Lance A Leventhal, 1979) Programming the 6502 (Rodnay Zaks, 1979)