PIC18 cheatsheet
ADDWFADDWFCANDWFCLRFCOMFCPFSEQCPFSGTCPFSLTDECFDECFSZDCFSNZINCFINCFSZINFSNZIORWFMOVFMOVFFMOVWFMULWFNEGFRLCFRLNCFRRCFRRNCFSETFSUBFWBSUBWFSUBWFBSWAPFTSTFSZXORWF
BCFBSFBTFSCBTFSSBTG
BCBNBNCBNNBNOVBNZBOVBRABZCALLCLRWDTDAWGOTONOPPOPPUSHRCALLRESETRETFIERETLWRETURNSLEEP
ADDLWANDLWIORLWLFSRMOVLBMOVLWMULLWRETLWSUBLWXORLW
TBLRD*TBLRD*+TBLRD*-TBLRD+*TBLWT*TBLWT*+TBLWT*-TBLWT+*

IORLW

Detailed reference for the IORLW instruction in PIC18 ISA.

Description

Perform a bitwise inclusive OR between WREG and an 8‑bit literal value.

  • The result of the operation is stored back into WREG.
  • The status register Z is set if the resulting value is zero; otherwise it is cleared.
  • This instruction does not affect the carry flag or any other status bits.

Examples

; W=0x20 before
IORLW 0x10 ; W = 0x20 | 0x10 = 0x30
; W=0x00 before
IORLW 0xFF ; W = 0x00 | 0xFF = 0xFF
; W=0xF0 before
IORLW 0x0F ; W = 0xF0 | 0x0F = 0xFF
; W already contains 0x1C, OR with 0x2A
IORLW 0x2A ; W = 0x1C | 0x2A = 0x3F