# PM Opc SHL

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## SHL = Shift Left

Hex | Mnemonic | Cycles |
---|---|---|

CE 84 | SHL A | 12 |

CE 85 | SHL B | 12 |

CE 86 nn | SHL [N+#nn] | 20 |

CE 87 | SHL [HL] | 16 |

### Execute

A = Register A B = Register B [N+#nn] = Memory: (I shl 16) or (N shl 8) or #nn [HL] = Memory: (I shl 16) or HL

; SHL Ds ; ; Ds = Source/Destination Ds = Ds SHL 1

### Description

"8-Bits Destination" bits are shifted left by 1.

NOTE: This instruction can be used as an unsigned integer multiplication by 2.

### Conditions

Zero: Set when result is 0

Carry: Set when the old bit 7 was 1

Sign: Set when bit 7 of the result is 1

Overflow remain unchanged

### Examples

; A = 0x04 (4)SHL A; A = 0x08 (8) ; F = (Zero=0):(Carry=0):(Sign=0)

; B = 0x45 (69)SHL B; B = 0x8A (138) ; F = (Zero=0):(Carry=0):(Sign=1)

; B = 0x84 (138)SHL B; B = 0x14 (20) ; F = (Zero=0):(Carry=1):(Sign=0)

; [HL] = 0x80 (128)SHL [HL]; [HL] = 0x00 (0) ; F = (Zero=1):(Carry=1):(Sign=0)