s3c2410a Samsung Semiconductor, Inc., s3c2410a Datasheet - Page 176

• Manufacturer Part Number: s3c2410a
• Description: 16/32-bit Risc Arm Microprocessor
• Manufacturer: Samsung Semiconductor, Inc.

THUMB INSTRUCTION SET
FORMAT 13: ADD OFFSET TO STACK POINTER
OPERATION
This instruction adds a 9-bit signed constant to the stack pointer. The following table shows the THUMB assembler
syntax.
NOTE:
INSTRUCTION CYCLE TIMES
All instructions in this format have an equivalent ARM instruction as shown in Table 4-14. The instruction cycle times
for the THUMB instruction are identical to that of the equivalent ARM instruction.
EXAMPLES
4-30
L
0
1
The offset specified by #Imm can be up to -/+ 508, but must be word-aligned (ie with bits 1:0 set to 0)
since the assembler converts #Imm to an 8-bit sign + magnitude number before placing it in field SWord7.
The condition codes are not set by this instruction.
ADD SP, #Imm
ADD SP, # -Imm
15
1
THUMB assembler
ADD
ADD
14
0
13
1
SP, #268
SP, #-104
12
1
11
0
Table 4-14. The ADD SP Instruction
ADD R13, R13, #Imm
SUB R13, R13, #Imm
10
0
[6:0] 7-bit Immediate Value
[7] Sign Flag
0 = Offset is positive
1 = Offset is negative
ARM equivalent
Figure 4-14. Format 13
9
0
8
0
; SP (R13) := SP + 268, but don't set the condition codes.
; Note that the THUMB opcode will
; contain 67 as the Word7 value and S=0.
; SP (R13) := SP - 104, but don't set the condition codes.
; Note that the THUMB opcode will contain
; 26 as the Word7 value and S=1.
S
7
6
Add #Imm to the stack pointer (SP).
Add #-Imm to the stack pointer (SP).
SWord 7
Action
0
S3C2410A