6809/6309 Mnemonic Lookup

You can lookup a single instruction by typing LD in the instruction field, which will show all load instructions. You can also lookup multiple instructions like LD,CMP.

You can also lookup mnemonics like LDX,LDY in the mnemonic field.

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Not case sensitive.

Instruction: Lookup

Mnemonic: Lookup

* = 6309		Immediate			Direct			Indexed			Extended			Inherent			Relative			Register			Memory
*	Mnemonic	Opcode	Cycles	Length	Opcode	Cycles	Length	Opcode	Cycles	Length	Opcode	Cycles	Length	Opcode	Cycles	Length	Opcode	Cycles	Length	Opcode	Cycles	Length	Opcode	Cycles	Length
*	ADDW	108B	5/4	4	109B	7/5	3	10AB	7+/6+	3+	10BB	8/6	4

E	F	H	I	N	Z	V	C
-	-	X	-	X	X	X	X

"-" = unaffected, "X" = modified, "1" = set, "0" = cleared, "?" = undefined

Description:

Add Memory Word to 16-Bit Accumulator [r' <- r + (M:M+1)]1a

Documenation

These instructions add the contents of a double-byte value in memory with one of the 16bit accumulators (D,W). The 16-bit result is placed back into the specified accumulator.

• H The Half-Carry flag is not affected by these instructions.
• N The Negative flag is set equal to the new value of bit 15 of the accumulator.
• Z The Zero flag is set if the new accumulator value is zero; cleared otherwise.
• V The Overflow flag is set if an overflow occurred; cleared otherwise.
• C The Carry flag is set if a carry out of bit 15 occurred; cleared otherwise.

The 16-bit ADD instructions are used for double-byte addition, and for addition of the least-significant word of multi-byte additions. See the description of the ADCD instruction for an example of how 32-bit addition can be performed on a 6309 processor.