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HCS12 Datasheet(PDF) 138 Page - Freescale Semiconductor, Inc

Part # HCS12
Description  HCS12 Microcontrollers
PDF  452 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

HCS12 Datasheet(HTML) 138 Page - Freescale Semiconductor, Inc

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S12CPUV2 Reference Manual, Rev. 4.0
138
Freescale Semiconductor
Operation:
(PC) + $0002
⇒ PC
Description:
Never branches. BRN is effectively a 2-byte NOP that requires one cycle to
execute. BRN is included in the instruction set to provide a complement to
the BRA instruction. The instruction is useful during program debug, to
negate the effect of another branch instruction without disturbing the offset
byte. A complement for BRA is also useful in compiler implementations.
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 BRN branch condition is never
satisfied, the branch is never taken, and only a single program fetch is
needed to update the instruction queue.
See 3.8 Relative Addressing Mode for details of branch execution.
BRN
Branch Never
BRN
CCR Details:
S
X
HIN
Z
V
C
––––––––
Source Form
Address
Mode
Object Code
Access Detail
HCS12
M68HC12
BRN rel8
REL
21 rr
P
P



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