6510/65816 Addressing mode: Stack (Push) -- s (PHP,PHA,PHY,PHX,PHD,PHK,PHB) (1 byte) (3 and 4 cycles) +---------------+------------------+-----------------------+----------+ | Cycle | Address Bus | Data Bus |Read/Write| +---------------+------------------+-----------------------+----------+ | 1 | PBR,PC | Op Code | R | | 2 | PBR,PC+1 | Internal Operation | R | | 3a | 0,S | Register High | W | | 3 | 0,S-1 | Register Low | W | +---------------+------------------+-----------------------+----------+ See also: Abbreviations