Nintendo DMG-01 Manual - Page 95

correct representation of Binary Coded Decimal BCD

Get Nintendo DMG-01 - Game Boy Console PDF manuals and user guides View all Nintendo DMG-01 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 95 highlights

Game BoyTM CPU Manual 3.3.5. Miscellaneous 2. DAA Description: Decimal adjust register A. This instruction adjusts register A so that the correct representation of Binary Coded Decimal (BCD) is obtained. Flags affected: Z - Set if register A is zero. N - Not affected. H - Reset. C - Set or reset according to operation. Opcodes: Instruction Parameters DAA -/- Opcode Cycles 27 4 3. CPL Description: Complement A register. (Flip all bits.) Flags affected: Z - Not affected. N - Set. H - Set. C - Not affected. Opcodes: Instruction Parameters CPL -/- Opcode Cycles 2F 4 by DP Page 95

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
  • 133
  • 134
  • 135
  • 136
  • 137
  • 138
  • 139
Game Boy
TM
CPU Manual
3.3.5. Miscellaneous
2.
DAA
Description:
Decimal adjust register A.
This instruction adjusts register A so that the
correct representation of Binary Coded Decimal (BCD)
is obtained.
Flags affected:
Z - Set if register A is zero.
N - Not affected.
H - Reset.
C - Set or reset according to operation.
Opcodes:
Instruction
Parameters
Opcode
Cycles
DAA
-/-
27
4
3.
CPL
Description:
Complement A register. (Flip all bits.)
Flags affected:
Z - Not affected.
N - Set.
H - Set.
C - Not affected.
Opcodes:
Instruction
Parameters
Opcode
Cycles
CPL
-/-
2F
4
by DP
Page 95