NEC 78K/0 Series - Manual (Page 77)

77
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