HMCS44C,HMCS44CL-------------------------------------------------------
[NOTE)
1.
(XV)
aft.r
a mn.monic code
has
four m.anings
as
follows.
Mnemonic only Instruction .xecution only
Mn.monic with X
Aft.r
instruction .xecution, X -
SPX
Mn.monic with Y
Aft.r
instruction .xecution, Y -
Spy
Mn.monic with
XY
Aft.r
instruction .xecution, X -
SPX,
Y -
Spy
[Exampl.) LAM M - A
LAMX M
-
A,
X -
SPX
LAMY M - A, Y -
Spy
LAMXY M - A, X -
SPX,
Y -
SPY
2. StatUI column shows the factor which brings the Status F
/F
"1"
under judg.ment instruction or instruction accompanying the judgem.nt.
NZ
........ ·ALU Not
Z.ro
C ........ ·ALU Overflow
in
Addition, that
is,
Carry
NB
........ ·ALU Overflow in Subtraction, that
is,
No Borrow
Except above ........
·Cont.nts
of
the status column affects the Status F/F directly.
3. The Carry F/F
(C(F/F))
is
not always affected by executing the instruction which affects the Status
F/F.
Instructions which affect the Carry F/F ar
••
ight
as
follows.
AMC
SEC
SMC
REC
DAA
ROTL
DAS
ROTR
4. All instructions exc.pt the
patt.rn
instruction
(P)
are
ex.cut.d
in
1 instruction cycl..
Th.
pattern instruction
(P)
is
executed
in 2 instruction
cycles.
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