2.2.47 (1) ROTL (B)
ROTL (ROTate Left)
Rotate
Operation
Rd (left rotation)
→
Rd
Assembly-Language Format
ROTL.B
Rd
Operand Size
Byte
Condition Code
H: Previous value remains unchanged.
N: Set to 1 if the result is negative; otherwise
cleared to 0.
Z:
Set to 1 if the result is zero; otherwise
cleared to 0.
V: Always cleared to 0.
C: Receives the previous value in bit 7.
I
UI
H
U
N
Z
V
C
—
—
—
—
↕
↕
0
↕
Description
This instruction rotates the bits in an 8-bit register Rd (destination register) one bit to the left. The
most significant bit is rotated to the least significant bit (bit 0), and also copied to the carry flag.
Available Registers
Rd: R0L to R7L, R0H to R7H
Operand Format and Number of States Required for Execution
Notes
MSB
LSB
C
b
7
b
0
. . . . . .
Instruction Format
1st byte
2nd byte
3rd byte
4th byte
Register direct
ROTL.B
Rd
1
2
8
rd
2
No. of
States
Addressing
Mode
Mnemonic
Operands
147