ROL ACC
6-310
ROL ACC Rotate Accumulator Left
SYNTAX OPTIONS OPCODE OBJMODE RPT CYC
ROL ACC 1111 1111 0101 0011 X Y N+1
Operands ACC Accumulator register
Description Rotate the content of the ACC register left by one bit, filling bit 0 with the
content of the carry flag and loading the carry flag with the bit shifted out:
ACC
Rotate LeftC
ACC
Flags and
Modes
N After the operation, the N flag is set if bit 31 of the ACC is 1, else N is cleared.
Z After the operation, the Z flag is set if the ACC is zero, else Z is cleared.
C The value in bit 31 of the ACC register is transferred to C. The value in C
before the rotation is transferred to bit 0 of the ACC.
Repeat This instruction is repeatable. If the operation follows a RPT instruction, then
the ROL instruction will be executed N+1 times. The state of the Z, N, and C
flags will reflect the final result.
Example
; Rotate contents of VarA left by 5:
MOVL ACC,@VarA ; ACC = VarA
RPT #4 ; Repeat next instruction 5 times
||ROL ACC ; Rotate ACC left
MOVL @VarA,ACC ; Store result into VarA
To Next Page
Loading...
Need help?
General
