s3c4510b Samsung Semiconductor, Inc., s3c4510b Datasheet - Page 116

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

INSTRUCTION SET
INSTRUCTION CYCLE TIMES
All instructions in this format have an equivalent ARM instruction as shown in Table 3-12. The instruction cycle
times for the THUMB instruction are identical to that of the equivalent ARM instruction.
THE BX INSTRUCTION
BX performs a branch to a routine whose start address is specified in a Lo or Hi register.
Bit 0 of the address determines the processor state on entry to the routine:
Bit 0 = 0
Bit 0 = 1
3-74
OP H1
00
00
00
01
01
01
10
10
00
00
00
0
1
1
0
1
1
0
1
0
1
1
H2
1
0
1
1
0
1
1
0
1
0
1
Causes the processor to enter ARM state.
Causes the processor to enter THUMB state.
ADD Rd, Hs
ADD Hd, Rs
ADD Hd, Hs
CMP Rd, Hs
CMP Hd, Rs
CMP Hd, Hs
MOV Rd, Hs
MOV Hd, Rs
MOV Hd, Hs
BX Rs
BX Hs
The action of H1 = 1 for this instruction is undefined, and should not be used.
THUMB Assembler
Table 3-12. Summary of Format 5 Instructions
ADD Rd, Rd, Hs
ADD Hd, Hd, Rs
ADD Hd, Hd, Hs
CMP Rd, Hs
CMP Hd, Rs
CMP Hd, Hs
MOV Rd, Hs
MOV Hd, Rs
MOV Hd, Hs
BX Rs
BX Hs
ARM Equivalent
NOTE
Add a register in the range 8-15 to a register in
the range 0-7.
Add a register in the range 0-7 to a register in
the range 8-15.
Add two registers in the range 8-15.
Compare a register in the range 0-7 with a
register in the range 8-15. Set the condition
code flags on the result.
Compare a register in the range 8-15 with a
register in the range 0-7. Set the condition
code flags on the result.
Compare two registers in the range 8-15. Set
the condition code flags on the result.
Move a value from a register in the range 8-15
to a register in the range 0-7.
Move a value from a register in the range 0-7
to a register in the range 8-15.
Move a value between two registers in the
range 8-15.
Perform branch (plus optional state change) to
address in a register in the range 0-7.
Perform branch (plus optional state change) to
address in a register in the range 8-15.
Action
S3C4510B