Detailed reference for the TBLWT+* instruction in PIC18 ISA.
Write the contents of WREG to the table memory location addressed by TBLPAG and the 16‑bit TBLPTR registers.
The +* suffix indicates a pre‑increment operation: the table pointer is incremented before the write takes place. After execution the updated TBLPTR points to the next address. The instruction does not affect any status bits.
The pointer increment wraps around, carrying into TBLPAG as necessary.
; WREG=0x55, TBLPAG=0x00, TBLPTR=0x0010 before execution
TBLWT+* ; WREG written to table address (after pre‑increment); WREG=0x55, TBLPAG=0x00, TBLPTR=0x0010 before execution
TBLWT+* ; WREG written to table address (after pre‑increment); WREG=0xA5, TBLPAG=0x01, TBLPTR=0x00FF before execution (carry into high byte)
TBLWT+* ; WREG written to address 0x0100; WREG=0xA5, TBLPAG=0x01, TBLPTR=0x00FF before execution (carry into high byte)
TBLWT+* ; WREG written to address 0x0100; WREG=0x00, TBLPAG=0x00, TBLPTR=0xFFFF before execution
TBLWT+* ; pointer overflows to 0x0000, WREG written at 0x0000; WREG=0x00, TBLPAG=0x00, TBLPTR=0xFFFF before execution
TBLWT+* ; pointer overflows to 0x0000, WREG written at 0x0000