S3C4530A datasheet(76/432 Pages) SAMSUNG

Part #	S3C4530A

Description	16/32-bit RISC microcontroller is a cost-effective, high-performance microcontroller

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Manufacturer	SAMSUNG [Samsung semiconductor]

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INSTRUCTION SET

S3C4530A

3-34

HALFWORD AND SIGNED DATA TRANSFER (LDRH/STRH/LDRSB/LDRSH)

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 3-16.

These instructions are used to load or store half-words of data and also load sign-extended bytes or half-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

27

19

15

Cond

28

16

11

12

21

23

0

20

L

Rn

Rd

[3:0] Offset Register

[6][5] S H

0 0 = SWP instruction

0 1 = Unsigned halfwords

1 1 = Signed byte

1 1 = Signed half words

[15:12] Source/Destination Register

[19:16] Base Register

[20] Load/Store

0 = Store to memory

1 = Load from memory

[21] Write-back

0 = No write-back

1 = Write address into base

[23] Up/Down

0 = Down: subtract offset from base

1 = Up: add offset to base

[24] Pre/Post Indexing

0 = Post: add/subtract offset after transfer

1 = Pre: add/subtract offset bofore transfer

[31:28] Condition Field

22

000

P U

0000

W

24

25

1

Rm

S H 1

8 7 6

5 4 3

0

Figure 3-16. Half-word and Signed Data Transfer with Register Offset

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