S3C2400X01 RISC MICROPROCESSOR
FORMAT 18: UNCONDITIONAL BRANCH
This instruction performs a PC-relative Branch. The THUMB assembler syntax is shown below. The branch offset
must take account of the prefetch operation, which causes the PC to be 1 word (4 bytes) ahead of the current
The address specified by label is a full 12-bit two's complement address,
but must always be halfword aligned (ie bit 0 set to 0), since the assembler places label >> 1 in the Offset11 field.
BAL label (halfword offset)
Table 4-19. Summary of Branch Instruction
[10:0] Immediate Value
Figure 4-19. Format 18
; Branch onto itself. Assembles to 0xE7FE.
; (Note effect of PC offset).
; Branch to 'jimmy'.
; Note that the THUMB opcode will contain the number of
; halfwords to offset.
; Must be halfword aligned.
Branch PC relative +/- Offset11 << 1, where label is
PC +/- 2048 bytes.
THUMB INSTRUCTION SET