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LBRA
(PC) + $0004 + Rel ⇒ PC
Operation:
Description:
Unconditional branch to an address calculated as shown in the expres-
sion. 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 al-
ways be refilled, so execution time is always the larger value.
See
Condition Codes and Boolean Formulas:
S
–
None affected.
Addressing Modes, Machine Code, and Execution Times:
Source Form
LBRA rel16
MOTOROLA
6-118
Long Branch Always
3.7 Relative Addressing Mode
X
H
I
N
Z
–
–
–
–
–
Address Mode
REL
INSTRUCTION GLOSSARY
for details of branch execution.
V
C
–
–
Object Code
18 20 qq rr
LBRA
Cycles
Access Detail
4
OPPP
CPU12
REFERENCE MANUAL
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