6809/6309 Mnemonic Lookup

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

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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
	BGE																2C	3	2

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

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

Description:

Branch If Greater than or Equal to Zero [IF CC.N = CC.V then PC' <- PC + IMM]

Documenation

When used following a subtract or compare of signed (twos-complement) values, the BGE instruction will branch if the source (register) value was greater than or equal to the operand value.

Example

                lda     #5  
                cmpa    #5  
                bge     ge  ; branches
                nop  
ge              cmpa    #9  
                bge     ge2 ; does not branch 
                nop  
ge2             cmpa    #1  
                bge     ge3 ; branches 
                nop  
ge3             nop  
                nop  
                rts