Nintendo DMG-01 Manual - Page 89
DEC n
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Game BoyTM CPU Manual 3.3.3. 8-Bit ALU 10. DEC n Description: Decrement register n. Use with: n = A,B,C,D,E,H,L,(HL) Flags affected: Z - Set if reselt is zero. N - Set. H - Set if no borrow from bit 4. C - Not affected. Opcodes: Instruction DEC DEC DEC DEC DEC DEC DEC DEC Parameters A B C D E H L (HL) Opcode 3D 05 0D 15 1D 25 2D 35 Cycles 4 4 4 4 4 4 4 12 by DP Page 89
Game Boy
TM
CPU Manual
3.3.3. 8-Bit ALU
10.
DEC n
Description:
Decrement register n.
Use with:
n = A,B,C,D,E,H,L,(HL)
Flags affected:
Z - Set if reselt is zero.
N - Set.
H - Set if no borrow from bit 4.
C - Not affected.
Opcodes:
Instruction
Parameters
Opcode
Cycles
DEC
A
3D
4
DEC
B
05
4
DEC
C
0D
4
DEC
D
15
4
DEC
E
1D
4
DEC
H
25
4
DEC
L
2D
4
DEC
(HL)
35
12
by DP
Page 89