s3c4510b Samsung Semiconductor, Inc., s3c4510b Datasheet - Page 123

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

S3C4510B
FORMAT 9: LOAD/STORE WITH IMMEDIATE OFFSET
OPERATION
These instructions transfer byte or word values between registers and memory using an immediate 5 or 7-bit offset. The
THUMB assembler syntax is shown in Table 3-16
NOTE: For word accesses (B = 0), the value specified by #Imm is a full 7-bit address, but must be word-aligned
L
0
0
1
1
B
0
1
0
1
(ie with bits 1:0 set to 0), since the assembler places #Imm >> 2 in the Offset5 field.
15
0
STR Rd, [Rb, #Imm]
LDR Rd, [Rb, #Imm]
STRB Rd, [Rb, #Imm] STRB Rd, [Rb, #Imm] Calculate the target address by adding together the
LDRB Rd, [Rb, #Imm] LDRB Rd, [Rb, #Imm] Calculate source address by adding together the
THUMB Assembler
14
1
13
1
12
B
Table 3-16. Summary of Format 9 Instructions
11
L
STR Rd, [Rb, #Imm]
LDR Rd, [Rb, #Imm]
ARM Equivalent
10
[2:0] Source/Destination Register
[5:3] Base Register
[10:6] Offset Register
[11] Load/Store Flag
0 = Store to memory
1 = Load from memory
[12] Byte/Word Flad
0 = Transfer word quantity
1 = Transfer byte quantity
Figure 3-38. Format 9
Offset5
Calculate the target address by adding together the
value in Rb and Imm. Store the contents of Rd at
the address.
Calculate the source address by adding together the
value in Rb and Imm. Load Rd from the address.
value in Rb and Imm. Store the byte value in Rd at
the address.
value in Rb and Imm. Load the byte value at the
address into Rd.
6
5
Rb
Action
3
2
INSTRUCTION SET
Rd
0
3-81