## PACK = Pack Nibbles

Hex | Mnemonic | Cycles
--- | --- | ---
DE | PACK | 8

### Execute

    A        =  (8-Bits) Register A
    B        =  (8-Bits) Register B

    ; PACK

    A = (A AND 0x0F) OR (B SHL 4)

### Description

Pack low nibble of register A and B and return the formed byte into register A.

Register A forms the lower nibble and register B forms the higher nibble.

### Conditions

None

### Examples

    ; A = 0x01
    ; B = 0x02
    PACK
    ; A = 0x21
    ; B = 0x02 (Remain unchanged)

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