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HCS12 数据表(PDF) 75 Page - Freescale Semiconductor, Inc

部件名 HCS12
功能描述  HCS12 Microcontrollers
PDF  452 Pages
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制造商  FREESCALE [Freescale Semiconductor, Inc]
网页  http://www.freescale.com
标志 FREESCALE - Freescale Semiconductor, Inc

HCS12 数据表(HTML) 75 Page - Freescale Semiconductor, Inc

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S12CPUV2 Reference Manual, Rev. 4.0
Freescale Semiconductor
75
5.19.2 Long Branch Instructions
Long branch instructions operate this way: When a specified condition is
met, a signed 16-bit offset is added to the value in the program counter.
Program execution continues at the new address. Long branches are used
when large displacements between decision-making steps are necessary.
The numeric range of long branch offset values is $8000 (–32,768) to $7FFF
(32,767) from the address of the next memory location after the offset value.
This permits branching from any location in the standard 64-Kbyte address
map to any other location in the 64-Kbyte map.
Table 5-18 is a summary of the long branch instructions.
Table 5-18. Long Branch Instructions
Mnemonic
Function
Equation or Operation
Unary Branches
LBRA
Long branch always
1
= 1
LBRN
Long branch never
1
= 0
Simple Branches
LBCC
Long branch if carry clear
C
= 0
LBCS
Long branch if carry set
C
= 1
LBEQ
Long branch if equal
Z
= 1
LBMI
Long branch if minus
N = 1
LBNE
Long branch if not equal
Z
= 0
LBPL
Long branch if plus
N
= 0
LBVC
Long branch if overflow clear
V
= 0
LBVS
Long branch if overflow set
V
= 1
Unsigned Branches
LBHI
Long branch if higher
C
+ Z = 0
LBHS
Long branch if higher or same
C
= 0
LBLO
Long branch if lower
Z
= 1
LBLS
Long branch if lower or same
C
+ Z = 1
Signed Branches
LBGE
Long branch if greater than or equal
N
⊕ V = 0
LBGT
Long branch if greater than
Z
+ (N ⊕ V) = 0
LBLE
Long branch if less than or equal
Z
+ (N ⊕ V) = 1
LBLT
Long branch if less than
N
⊕ V = 1



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