Laptop User Manual

S3C2440A RISC MICROPROCESSOR THUMB INSTRUCTION SET
4-39
INSTRUCTION CYCLE TIMES
This instruction format does not have an equivalent ARM instruction.
Table 4-20. The BL Instruction
L THUMB assembler ARM equivalent Description
0 BL label none LR := PC + OffsetHigh << 12
1 temp := next instruction address
PC := LR + OffsetLow << 1
LR := temp | 1
EXAMPLES
BL faraway ; Unconditionally Branch to 'faraway'
next
• and place following instruction
• address, ie "next", in R14,the Link register and
set bit 0 of LR high.
Note that the THUMB opcodes will contain the
number of halfwords to offset.
faraway
• ; Must be Half-word aligned.
•