s3c4510b Samsung Semiconductor, Inc., s3c4510b Datasheet - Page 46
s3c4510b
Manufacturer Part Number
s3c4510b
Description
16/32-bit Risc Microcontroller
Manufacturer
Samsung Semiconductor, Inc.
Datasheet
1.S3C4510B.pdf
(422 pages)
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INSTRUCTION SET
THE CONDITION FIELD
In ARM state, all instructions are conditionally executed according to the state of the CPSR condition codes and
the instruction s condition field. This field (bits 31:28) determines the circumstances under which an instruction is
to be executed. If the state of the C, N, Z and V flags fulfils the conditions encoded by the field, the instruction is
executed, otherwise it is ignored.
There are sixteen possible conditions, each represented by a two-character suffix that can be appended to the
instruction s mnemonic. For example, a branch (B in assembly language) becomes BEQ for "Branch if "Equal",
which means the branch will only be taken if the Z flag is set.
In practice, fifteen different conditions may be used: these are listed in Table 3-2. The sixteenth (1111) is
reserved, and must not be used.
In the absence of a suffix, the condition field of most instructions is set to “Always" (suffix AL). This means the
instruction will always be executed regardless of the CPSR condition codes.
3-4
Code
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
Suffix
EQ
NE
CS
CC
VC
GE
GT
VS
PL
LS
LT
LE
AL
MI
HI
Z set
Z clear
C set
C clear
N set
N clear
V set
V clear
C set and Z clear
C clear or Z set
N equals V
N not equal to V
Z clear AND (N equals V)
Z set OR (N not equal to V)
(Ignored)
Table 3-2. Condition Code Summary
Flags
Equal
Not equal
Unsigned higher or same
Unsigned lower
Negative
Positive or zero
Overflow
No overflow
Unsigned higher
Unsigned lower or same
Greater or equal
Less than
Greater than
Less than or equal
Always
Meaning
S3C4510B
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