Rotate one bit left through the carry bit (dalu), Operation assembler syntax – Freescale Semiconductor StarCore SC140 User Manual
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SC140 DSP Core Reference Manual
ROL
ROL
Rotate One Bit Left Through the Carry Bit (DALU)
ROL
Description
Status and Conditions that Affect Instruction
Status and Conditions Changed by Instruction
Example
rol d5
Operation
Assembler Syntax
(Dn[38:0]<<1)
→ Dn[39:1]
Dn[39]
→ C
C
→ Dn[0]
ROL Dn
ROL Dn
Rotates the contents of a data register (Dn) one bit to the left. The carry bit C is shifted to bit 0, bit 39 is
copied to the carry bit, and bits [38:0] are copied to bits [39:1].
Register Address
Bit Name
Description
SR[0]
C
The carry bit is copied into Dn[0].
Register Address
Bit Name
Description
SR[0]
C
Set if bit 39 in the data register was one before rotation. Cleared if
bit 39 in the data register was zero before rotation.
Ln
L
Clears the Ln bit in the destination register.
Register/Memory Address
Before
After
SR
$00E4 0000
$00E4 0001
L5:D5
$0:$FF A000 0005
$0:$FF 4000 000A
0
15
16
31
32
39
C