s3c4510b Samsung Semiconductor, Inc., s3c4510b Datasheet - Page 137
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s3c4510b
Manufacturer Part Number
s3c4510b
Description
16/32-bit Risc Microcontroller
Manufacturer
Samsung Semiconductor, Inc.
Datasheet
1.S3C4510B.pdf
(422 pages)
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S3C4510B
FORMAT 19: LONG BRANCH WITH LINK
OPERATION
This format specifies a long branch with link.
The assembler splits the 23-bit two’s complement half-word offset specified by the label into two 11-bit halves,
ignoring bit 0 (which must be 0), and creates two THUMB instructions.
Instruction 1 (H = 0)
In the first instruction the Offset field contains the upper 11 bits of the target address. This is shifted left by 12 bits
and added to the current PC address. The resulting address is placed in LR.
Instruction 2 (H =1)
In the second instruction the Offset field contains an 11-bit representation lower half of the target address. This is
shifted left by 1 bit and added to LR. LR, which now contains the full 23-bit address, is placed in PC, the address
of the instruction following the BL is placed in LR and bit 0 of LR is set.
The branch offset must take account of the prefetch operation, which causes the PC to be 1 word (4 bytes) ahead
of the current instruction.
15
1
14
1
13
1
12
1
11
[10:0] Long Branch and Link Offset High/Low
[11] Low/High Offset Bit
0 = Offset high
1 = Offset low
H
10
Figure 3-48. Format 19
Offset
INSTRUCTION SET
0
3-95
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