Table of Contents
Advertisement
BRA
(PC) + $0002 + 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 byte of the 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 BRA branch condition is always
satisfied, the branch is always taken, and the instruction queue must al-
ways be refilled.
See
Condition Codes and Boolean Formulas:
S
–
None affected.
Addressing Modes, Machine Code, and Execution Times:
Source Form
BRA rel8
MOTOROLA
6-44
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
20 rr
BRA
Cycles
Access Detail
3
PPP
CPU12
REFERENCE MANUAL
Advertisement
Table of Contents
