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Table 2.6
Branching Instructions
Instruction
Size
Bcc*
—
JMP
—
BSR
—
JSR
—
RTS
—
Note: * Conditional branch instructions are generally called the Bcc instructions.
Function
Branches to a specified address if a specified condition is true. The
branching conditions are listed below.
Mnemonic
Description
BRA (BT)
Always (true)
BRN (BF)
Never (false)
BHI
High
BLS
Low or same
Bcc (BHS)
Carry clear (high or same)
BCS (BLO)
Carry set (low)
BNE
Not equal
BEQ
Equal
BVC
Overflow clear
BVS
Overflow set
BPL
Plus
BMI
Minus
BGE
Greater or equal
BLT
Less than
BGT
Greater than
BLE
Less or equal
Branches unconditionally to a specified address
Branches to a subroutine at a specified address
Branches to a subroutine at a specified address
Returns from a subroutine
Condition
Always
Never
C ∨ Z = 0
C ∨ Z = 1
C = 0
C = 1
Z = 0
Z = 1
V = 0
V = 1
N = 0
N = 1
N ⊕ V = 0
N ⊕ V = 1
Z ∨ (N ⊕ V) = 0
Z ∨ (N ⊕ V) = 1
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