XTAL
#define XTAL (CLKCTRL + 0x0050)
#define XTAL (CLKCTRL + 0x0080)
#define XTAL 10111000
#define XTAL 1011100 /* Hz, really 1.0111 MHz and a /10 prescaler */
#define XTAL 0x1 /* primary crystal oscillator (2050) */
#define XTAL 0xC000 /* b15-14: Crystal selection */