
A-50 SC140 DSP Core Reference Manual
ASL2A
ASL2A Arithmetic Shift Left ASL2A
By Two Bits (AGU)
Description
Status and Conditions that Affect Instruction
Status and Conditions Changed by Instruction
None.
Example
asl2a r0
Instruction Formats and Opcodes
Instruction Fields
Rx RRRR AGU Source/Destination Register
Operation Assembler Syntax
Rx<<2 → Rx
ASL2A Rx
ASL2A Rx
Shifts an AGU register (Rx) left two bits. Bits [29:0] are copied into bits [31:2]. Bits [1:0] are cleared.
Register Address Bit Name Description
SR[18] EXP Determines which stack pointer is used when the stack pointer is an
operand. Otherwise, the instruction is not affected by SR.
Register/Memory Address Before After
R0
$e001 0002 $8004 0008
Instruction Words Cycles Type Opcode
15 8 7 0
ASL2A Rx 1 1 2 1110RRRR11111110
0000 N0 0100 — 1000 R0 1100 R4
0001 N1 0101 — 1001 R1 1101 R5
0010 N2 0110 — 1010 R2 1110 R6
0011 N3 0111 SP 1011 R3 1111 R7
Note: This instruction can specify R8-R15 as operands by using a high register prefix.
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