D EY
DE
(Y) ← (Y) – 1
Op e r a t io n :
F u n c t io n :
This instruction subtracts one from the current contents of Y.
St a t u s fla g : N :
V :
T :
B :
I :
D :
Z :
C :
Addressing mode
∆DEY
Implied
CREMENT INDEX REGISTER
N is 1 when bit 7 is 1 after the operation; otherwise N is
0.
No change
No change
No change
No change
No change
Z is 1 when the operation result is 0; otherwise Z is 0.
No change
Statement
Y
BY ONE
Machine codes
Byte number
88
16
D EY
Cycle number
1
2
59