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.

To see all instructions click the Show All link.

Show All | Registers | Addressing Modes | Post Bytes | Acknowledgments | Sock's GIME Reference | Sock's CPU Cycle Data Charts

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
*	TIM				0B	6	3	6B	7+	3+	7B	7	4

E	F	H	I	N	Z	V	C
-	-	-	-	X	X	0	-

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

Description:

Bit Test Immediate Value with Memory Byte [TEMP ← (M) AND IMM8]

Documenation

The TIM instruction logically ANDs the contents of a byte in memory with an 8-bit immediate value. The resulting value is tested and then discarded. The Condition Codes are updated to reflect the results of the test as follows:

• N The Negative flag is set equal to bit 7 of the resulting value.
• Z The Zero flag is set if the resulting value was zero; cleared otherwise.
• V The Overflow flag is cleared by this instruction.
• C The Carry flag is not affected by this instruction.

TIM can be used as a space-saving optimization for a pair of equivalent 6809 instructions, and to perform a bit test without having to utilize a register. However, it is slower than the 6809 equivalent:

6809: (4 instruction bytes; 7 cycles):

 LDA #$3F 
 BITA 4,U

6309: (3 instruction bytes; 8 cycles):

 TIM #$3F;4,U

Note that the assembler syntax used for the TIM operand is non-typical. Some assemblers may require a comma (,) rather than a semicolon (;) between the immediate operand and the address operand.