The 1 register of WDT (Watchdog timer), from 0xBF800800, with their reset value and every field. The PIC32MZ2064DAL169 has 2254 registers in 102 peripherals, one page each.
Most PIC32 SFRs have three more registers right after them: CLR at +4, SET at +8 and INV at +C (T1CONCLR, T1CONSET, T1CONINV), which clear, set or flip just the bits written as 1, in one write.