HCS12 datasheet(210/452 Pages) FREESCALE

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Instruction Glossary

S12CPUV2 Reference Manual, Rev. 4.0

210

Freescale Semiconductor

Operation:

(PC) + $0004 + Rel

⇒ PC

Description:

Unconditional branch to an address calculated as shown in the expression.

Rel is a relative offset stored as a two’s complement number in the second

and third bytes of machine code corresponding to the long branch

instruction.

Execution time is longer when a conditional branch is taken than when it is

not, because the instruction queue must be refilled before execution

resumes at the new address. Since the LBRA branch condition is always

satisfied, the branch is always taken, and the instruction queue must always

be refilled, so execution time is always the larger value.

See 3.8 Relative Addressing Mode for details of branch execution.

LBRA

Long Branch Always

LBRA

CCR Details:

HIN

––––––––

Source Form

Address

Mode

Object Code

Access Detail

HCS12

M68HC12

LBRA rel16

REL

18 20 qq rr

OPPP

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