Implied Addressing

There are three types of Implied Addressing on the 65c816:

Type 1 - The register(s) to be operated on are implied in the mnemonic: (17 instructions)

• DEX (opcode CA)
• DEY (opcode 88)
• INX (opcode E8)
• INY (opcode C8)
• TAX (opcode AA)
• TAY (opcode A8)
• TCD (opcode 5B)
• TSC
• TDC (opcode 7B)
• TSC
• TSX
• TXA
• TXS
• TXY (opcode 9B)
• TYA
• TYX
• XBA (opcode EB)

Type 2 - The flag(s) to be operated on are implied in the mnemonic: (8 instructions)

• CLC (opcode 18)
• CLD (opcode D8)
• CLI (opcode 58)
• CLV (opcode B8)
• SEC
• SED
• SEI
• XCE

Type 3 - Neither flags nor registers operated on: (4 instructions)

• NOP (opcode EA)
• STP (opcode DB)
• WAI (opcode CB)
• WDM (opcode 42)

All implied instructions except for WDM are one byte long.

Reference

• Eyes & Lichty, page 398: https://archive.org/details/0893037893ProgrammingThe65816/page/n423
• page 127, lbid: https://archive.org/details/0893037893ProgrammingThe65816/page/n153