Radio Shack 26-3801 - Page 40

MACHINE CYCLE
STATUS
CONTROL
IO/M
SI
so TO wiS INTA
OPCODE
FETCH
IOFI
MEMORY READ {MR!
MEMORY WRITE IMWI
I/O READ
OORI
I/O WRITE (IOWI
ACKNOWLEDGE
Or
INTR
IINAI
BUS IDLE ISII:
OAO
ACK.
OF
RST.TRAF
HALT
1
1
1
1
TS
1
I
1
1
1
1
1
1
1
1
I
1
t
1
1
TS
1
1
1
a
1
t
i
TS
1
1
1
1
1
1
1
1
Table 2
80C85
MACHINE CYCLE
CHART
Maehina
Suu
|
Suiy.4
8uitl
]
Comrol
1
S1.S0
1
i i
*
l
IO/M
A
s
-A„(ADn-AO-,lRDWR!l'STAUi
e
j
|t,
X
X
X
j
X
i
!
i
r
!
Tj
X X
X
1
X
X
X
*fw*»T X
X
X
|
X
X
X
T
3
X
X
X
X
X
X
T
<
t
0>
X
TS
I
!
T
S
|
1 0'
X
! TS
'
I
T
«
I
1
<'
j
X
j TS '
1
1
.
T
RES6T
1
X
TS
! TS
|
TS
TS
|
,
f'o
T
MALT
j
TS-i TS
TS
TS|
i
!
o
T
HOLD
i
X
TS
i TS
j TS
TS
! 1
!
o !
3£
Table
3
80C85
MACHINE
STATE
CHART
T
.
/ \
T
»/~~\ T
»/
\
T
</~"
III/
-
\IlT~\lF~
CLK
iW
1
*."*..
Y K„ IHIOX ORDER
AOORESI
X
«•".
X
•°'°"
X
yv
\./y~~\
DATA
FROM MEMORY
ll/OK»r
ADORES)
n
-(""""X
,
X
ILOWOROER
DATA
FROM
aooress
MEMORY
r—\
(iittTRucnoi*
ALI
OATA TO
MEMORY
.
OR
MRlfHERAL
rv
n
SB
\
/ \
/
s*
\
/
m/S
"A
j
"A
«TATm
Y
S,S. IFETCHI Y U (REAOI V
01
WRlTf
x
«
Fig.
4
80C85
Basic System Timing
Ambient
Temperature
Under
Bias,
Storage
Temperature
,
Voltage
on Any Pin
With Respect
to
Ground
Power
Dissipation
.-40°C to
+85°C
,-55°C
to
+150°C
,-0.5°C
to +7
V
1.0 Watt
Table
4
Absolute
Maximum
Ratings