s3c4510b Samsung Semiconductor, Inc., s3c4510b Datasheet - Page 106

• Manufacturer Part Number: s3c4510b
• Description: 16/32-bit Risc Microcontroller
• Manufacturer: Samsung Semiconductor, Inc.

INSTRUCTION SET
THUMB INSTRUCTION SET FORMAT
The thumb instruction sets are 16-bit versions of ARM instruction sets (32-bit format). The ARM instructions are
reduced to 16-bit versions, Thumb instructions, at the cost of versatile functions of the ARM instruction sets. The
thumb instructions are decompressed to the ARM instructions by the Thumb decompressor inside the
ARM7TDMI core.
As the Thumb instructions are compressed ARM instructions, the Thumb instructions have the 16-bit format
instructions and have some restrictions. The restrictions by 16-bit format is fully notified for using the Thumb
instructions.
FORMAT SUMMARY
The THUMB instruction set formats are shown in the following figure.
3-64
10
11
12
13
14
15
16
17
18
19
1
2
3
4
5
6
7
8
9
15 14 13 12 11 10
15 14 13 12 11 10
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
0
0
0
1
1
1
1
1
1
0
0
0
0
0
1
1
1
1
1
1
0
0
1
0
0
0
0
0
1
0
0
1
1
1
0
0
0
1
1
1
B
1
0
0
0
1
1
0
1
0 SP
1
1
0
1
1
0
1
1
Op
Op
H
H
1
0
0
1
L
L
L
L
0
L
L
1
0
Figure 3-29. THUMB Instruction Set Formats
0
1
B
S
0
1
1
I
Cond
Op
Rd
Rd
Rd
Rd
Rb
9
0
1
0
0
1
9
Op
Offset5
Offset5
Offset5
R
8
0
1
8
Rn/offset3
Op
H1 H2
Ro
Ro
S
7
7
6
6
Offset11
Offset
5
5
Rs/Hs
Softset8
Rs
Rs
Offset8
Rs
Rb
Rb
Rb
Rb
Word8
Word8
Word8
Value8
4
4
Rlist
Rlist
SWord7
3
3
2
2
Rd/Hd
Rd
Rd
Rd
Rd
Rd
Rd
Rd
1
1
0
0
Move Shifted register
Add/subtract
Move/compare/add/
subtract immediate
ALU operations
Hi regiter operations
/branch exchange
PC-relative load
Load/store with register
offset
Load/store sign-extended
byte/halfword
Load/store with immediate
offset
Load/store halfword
SP-relative load/store
Load address
Add offset to stack pointer
Push/pop register
Multiple load/store
Conditional branch
Software interrupt
Unconditional branch
Long branch with link
S3C4510B