NEC 78K/0 Series User Manual
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CHAPTER 5 EXPLANATION OF INSTRUCTIONS
User's Manual U12326EJ4V0UM
Rotate Left
ROL
Byte Data Rotation to the Left
[Instruction format]
ROL dst, cnt
[Operation]
(CY, dst
0
← dst
7
, dst
m+1
← dst
m
)
× one time
[Operand]
Mnemonic
Operand(dst,cnt)
ROL
A, 1
[Flag]
Z
AC
CY
×
[Description]
•
The destination operand (dst) contents specified by the 1st operand are rotated to the left just once.
•
The MSB (bit 7) contents are simultaneously rotated to LSB (bit 0) and transferred to the CY flag.
[Description example]
ROL A, 1; The A register contents are rotated to the left by one bit.
CY
0
7