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 (opcode 3B)
• TDC (opcode 7B)
• TSC (opcode 3B)
• TSX (opcode BA)
• TXA (opcode 8A)
• TXS (opcode 9A)
• TXY (opcode 9B)
• TYA (opcode 98)
• TYX (opcode BB)
• 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 (opcode 38)
• SED (opcode F8)
• SEI (opcode 78)
• XCE (opcode FB)

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 on the 65c816 except for WDM are one byte long.

Syntax

CLC

References

• Eyes & Lichty, page 398: https://archive.org/details/0893037893ProgrammingThe65816/page/n423
• page 127, lbid: https://archive.org/details/0893037893ProgrammingThe65816/page/n153
• section 3.5.19 of 65c816 datasheet, https://westerndesigncenter.com/wdc/documentation/w65c816s.pdf