Sharp MZ-80B - Page 102

Mn emo nic
DAA
CP L
NEG
CCF
SCF
NOP
HALT
Dl
EI
IM 0
IM I
IM 2
Sy m bo l ic
Fl ags
OP-Co de
No.
No.
~0 .
of
of
M
of T
Co mmen ts
Operat ion
c
z P/V s N H
76 543 210
Bytes
Cycles
States
Converts ace con·
t t
p
t
•
t
00 100 Ill
I I 4
Decimal adjust accumulator
tent into packed
BCD fo ll ow in g add
or sub tra ct with
pa cked
BCD ope·
rands
A ~ A
•
•
• •
I I 00 1 01 Il l
I
I
4
Co mpl ement accumulator
(one's complement )
N
A ~ A + I
t
t
v
t
I
t
l1 101 101
2
2
8
Negate ace. ( two 's
01 000 100
co mp lement )
--
CY <- CY
t
•
•
•
0
X
00 Ill Ill
I
1
4
Co mpl ement ca rr y flag
CY~ I I
•
•
•
0
0
oo no 1 11
No operation
•
•
•
•
•
•
00 000 000
PC ~ PC + I
CPU halted
•
•
•
•
•
•
01 110 11 0
I
FF <- 0
•
•
•
•
• •
II 110011
I FF~ I
• •
•
•
•
•
II Ill 011
Sst inte rrupt
•
• • • • •
11 10 1 101
mode 0
01 ooo no
Set interrupt
•
•
•
•
•
•
11 10 1 1 01
mode 1
01 010 110
Set int err upt
•
• • •
•
•
11 10 1 101
mod e 2 01 Oil 11 0
Notes: IFF indicates the interru pt enable flip-flop
CY indicates the carry flip- fl op.
I
1
4
Se t carry fl ag
I
1
4
I
I
4
I
I
4
I
I
4
2
2
8
2
2
8
2
2
8
Flag No ta ti on : • = flag n ot affected, 0 = flag reset, 1 = flag set, X= fl ag is unknown,
t = flag is affected according to the resu lt of the operation.
GENERAL PURPOSE ARITHMETIC AND CPU CONTROL GROUPS
TABLE 4.3-5
95