HCS12 datasheet(74/452 Pages) FREESCALE

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S12CPUV2 Reference Manual, Rev. 4.0

Freescale Semiconductor

5.19.1 Short Branch Instructions

Short branch instructions operate this way: When a specified condition is

met, a signed 8-bit offset is added to the value in the program counter.

Program execution continues at the new address.

The numeric range of short branch offset values is $80 (–128) to $7F (127)

from the address of the next memory location after the offset value.

Table 5-17 is a summary of the short branch instructions.

Table 5-17. Short Branch Instructions

Mnemonic

Function

Equation or Operation

Unary Branches

BRA

Branch always

= 1

BRN

Branch never

= 0

Simple Branches

BCC

Branch if carry clear

= 0

BCS

Branch if carry set

= 1

BEQ

Branch if equal

= 1

BMI

Branch if minus

= 1

BNE

Branch if not equal

= 0

BPL

Branch if plus

= 0

BVC

Branch if overflow clear

= 0

BVS

Branch if overflow set

= 1

Unsigned Branches

Relation

BHI

Branch if higher

> MC + Z = 0

BHS

Branch if higher or same

≥ MC = 0

BLO

Branch if lower

< MC = 1

BLS

Branch if lower or same

≤ MC + Z = 1

Signed Branches

BGE

Branch if greater than or equal

≥ MN ⊕ V = 0

BGT

Branch if greater than

> MZ + (N ⊕ V) = 0

BLE

Branch if less than or equal

≤ MZ + (N ⊕ V) = 1

BLT

Branch if less than

< MN ⊕ V = 1

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