a)cygwin is a simulated environment running in Windows.22.rtc: real time clock 23.There are a lot of register specified in 44b.h a)for example:i.#define rBWSCON (*(volatile unsigned *)0x1c80000)ii.#define rBANKCON0 (*(volatile unsigned *)0x1c80004)iii.#define rBANKCON1 ...