Sharp PC-1500 - Page 36

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(E
X) I NC XL
XL = I 0 0
I I Exec ut e r I
I 1 0 I 1 ~ ____. XL= ~~ ~ _!._ 1 0 0 0
C= O , H= O , Z= O . V= O
@ DEC (DECrement)
The value of t he accumulator or re gister is DECremented by one. In t he ca se of the 8-
bit register (A , RL. RH). it makes flags C. V. Hand Zcha n ged . [n th e case of the 16-bit
r eg ister R r eg. no flag change takes pl ac e.
•F orma t
D FC /\
D EC RL
D EC RH
D EC Rr eg
(EX)
XL = I 0
XH = I 0
DEC Xreg
0 0 0 0 0 0
0 0 0 0 0
•Operation
[Operand] - I - [operand]
(C. V. H. and Z chan ged .)
[ Op erand) - I - [ op erand)
0 I XL= 1 1
1 1
1 I
Execut e
____.
1 I
XH = I 0
0 0 0 0 0
ol
2-4-3. Compare and bit test
@ CPA (ComPare Ace)
The co nc cnts of the accumul ator are compar ed w it h register or external memory. and
it s result is re pre se nted by flags C. V. H. and Z.
•F or mat
CPA RL
CPA RH
C PA (Rrcg)
CPA ll( Rr eg)
CPA (ab)
CPA ll(ab)
(E X) CPA XL
A=
lo
1
XL = I 0
0
I
0
I
0
1
0 0
•Operation
A - [operand] - chan ge i11 C. V. H. and Z
or
A + [ operand]+ I - chan ge in C. V. H. and Z
---c .
om panson
c
z v H
--,
0
0
A> [op erand]
·1
0
* *
A = [operand] 1
1
* *
A < [operand] 0 0
* *
* : Flags V and H may chan ge accord i ng to t he
co n dit i on mentioned in "Status flag", but it has
no meaning wi
th t he CPA instr uct i on .
O l E xec ut e
C= l , Z= O
o I
31
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