This page describes the following instruction:
- Group: PAIR
- Mnemonic: st
- Opcode: 237d, EDh
- Encoding: 1_110_1101b (PAIR_SRC_DST)
- Pseudo-code: if r!=0 then pc=sir else pc++
- S:SERIAL T:TRUE
- Source is the Serial Input register (SIR).
- If R is NOT zero, set the Program Counter to source.
The 'S' source is a deserialised byte received over the serial bus. See Device Communication for how this works. The 'T' 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.