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HMCS45C,HMCS45CL-------------------------------------------------------
[NOTE]
1. (XV)
after a mnemonic code has four meanings as follows.
Mnemonic only
Instruction execution only
Mnemonic with X
After instruction execution, X ... SPX
Mnemonic with Y
After instruction execution, Y ... SPY
Mnemonic with XY
After instruction execution, X ... SPX, Y ... SPY
[Example]
LAM
M ...:. A
LAMX
M
-+
A, X ... SPX
LAMY
M
-+
A, Y ... SPY
LAMXY
M
-+
A, X ... SPX, Y ... Spy
2. Status column shows the factor which brings the Status F/F "1" under judgement instruction or instruction accompanying the judgement.
NZ ...... ···ALU Not Zero
C····· ····ALU Overflow in Addition, that is, Carry
NB ..... ····ALU Overflow in Subtraction, that is, No Borrow
Except above ·········Contents 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 whicll affects the Status F/F.
Instructions which affect the Carry F/F are eight as follows.
AMC
SEC
SMC
REC
DAA
ROTL
DAS
ROTR
4. All instructions except the pattern instruction (P) are executed in 1 instruction cycle. The pattern instruction (P) is executed
in 2 instruction cycles.
80
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