This page describes the following instruction:
- Group: PAIR
- Mnemonic: pf
- Opcode: 254d, FEh
- Encoding: 1_111_1110b (PAIR_SRC_DST)
- Pseudo-code: if r==0 then pc=pir else pc++
- P:PARALLEL F:FALSE
- Source is the Parallel Input register (PIR).
- If R IS zero, set the Program Counter to source.
The 'P' source is a data byte received on the parallel bus. See Device Communication for how this works. The 'F' destination takes the source value as the target offset of a conditional jump (R==0) to within the current code page. See In-Page Branching for more on this.