Single Data Transfer (Ldr, Str) - Samsung S3C2501X User Manual

INSTRUCTION SET

3.9 SINGLE DATA TRANSFER (LDR, STR)

The instruction is only executed if the condition is true. The various conditions are defined in Table 3-2. The
instruction encoding is shown in Figure 3-14.
The single data transfer instructions are used to load or store single bytes or words of data. The memory address
used in the transfer is calculated by adding an offset to or subtracting an offset from a base register.
The result of this calculation may be written back into the base register if auto-indexing is required.
31 28 27
Cond 01
3-28
26 25 24 23 22 21 20 19
I P U B W L
[15:12] Source/Destination Registers
[19:16] Base Register
[20] Load/Store Bit
0 = Store to memory
1 = Load from memory
[21] Write-back Bit
0 = No write-back
1 = Write address into base
[22] Byte/Word Bit
0 = Transfer word quantity
1 = Transfer byte quantity
[23] Up/Down Bit
0 = Down: subtract offset from base
1 = Up: add offset to base
[24] Pre/Post Indexing Bit
0 = Post: add offset after transfer
1 = Pre: add offset bofore transfer
[25] Immediate Offset
0 = Offset is an immediate value
[11:0] Offset
11
[11:0] Unsigned 12-bit immediate offset
11
Shift
[3:0] Offset register [11:4] Shift applied to Rm
[31:28] Condition Field
Figure 3-14. Single Data Transfer Instructions
16 15 12 11
Rn Rd
0
Immediate
4 3 0
Rm
S3C2501X
0
Offset