2.5.6
Branching Instructions
Table 2-9 describes the branching instructions. Figure 2-8 shows their object code formats.
Table 2-9 Branching Instructions
Instruction
Size
Function
Bcc
—
Branches to the designated address if condition cc is true. The
branching conditions are given below.
Mnemonic
BRA (BT)
BRN (BF)
BHI
Description
Always (true)
Never (false)
High
Condition
Always
Never
C
C
Z = 0
Z = 1
BLS
Low or same
Carry clear (high or same)
Carry set (low)
Not equal
BCC (BHS)
BCS (BLO)
BNE
C = 0
C = 1
Z = 0
Z = 1
V = 0
V = 1
N = 0
N = 1
BEQ
Equal
BVC
Overflow clear
Overflow set
Plus
BVS
BPL
BMI
Minus
BGE
Greater or equal
Less than
N
N
V = 0
V = 1
BLT
BGT
Greater than
Less or equal
Z ⁄ (N V) = 0
Z ⁄ (N V) = 1
BLE
JMP
BSR
JSR
RTS
—
—
—
—
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
39
ETC [ ETC ]
