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TST
Op e r a t io n :
(M) = 0 ?
F u n c t io n :
This instruction tests whether the contents of M are "0" or not
and modifies the N and Z.
St a t u s fla g : N :
V :
T :
B :
I :
D :
Z :
C :
Addressing mode
∆TST∆$zz
Zero page
96
T
ST
E
FOR NEGATIVE OR ZERO
N is 1 when bit 7 of M is 1; otherwise N is 0.
No change
No change
No change
No change
No change
Z is 1 when the M content is 0; otherwise Z is 0.
No change
Statement
Machine codes
Byte number
64
, zz
16
16
TST
Cycle number
2
3
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