The 7 registers of I2C1 (I²C 1), from 0xBF820000, with their reset value and every field. The PIC32MZ1024ECG124 has 1229 registers in 91 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.