Tektronix P7001 /IEEE 488 Instruction Manual page 95

MC6820
Control of
CA2 and C82
(ORA-3, ORA-4, CRA~5, CRB-3, ORB-4, and
of the two control
and
3, 4, 5
Bits
C82
control the CA2 and
Peripheral
the control
determine
bits if
control
input output
or an
ORA-5 ORA-4
1
1
1
1
PIN ASSIGNMENT
1EV° CA1 J 40
_
P23
CA2
39
2
E
:1
lROA338
3CPA1
PA2 IRQB 37
4
C
:1
:
PA3 R80
35
5
:1
RS1 35
6 PA4
1
I:
J 34
PAS Hie—set
7
C
5
DO
FAG 33
8
E
PA7 D1 32
9 c
:1
02331
1OCPBO
11:
03
30
P81
:1
04
P82 29
12 :l
[2
D5 3
'3 P33 28
5
06 27
14
P134
E Cl
p35 D7 3 26
15
C
P35 3 25
E
E
1'5
C31 3
24
17 PB7
E
E
23
18 CB1
E D
b
C32 22
C30
19
C
3 21
20 Vcc R/W
E
®
Control
Lines
Peripheral
C885)
—
registers are used to
Control lines. These
lines interrupt
will be an
bit
signal. If ORA-5 (ORB-5)
-
CONTROL OF CA-2 AS AN OUTPUT
TABLE 6
CRA-S
CRA-3 Cleared
Low on negative
0
O
after an MPU Read
operation.
0 Low on negative
1
after
an MPU
~
operation.
0 Low when CRA-3 goes low
1
result of an
Control Register
Always high
as
1 1
be cleared on an
high. Will
is
Write to Control Register
MPU
"A" that
clears
"zero".
a
m
A
'°
___,
7,
'
.
1,4:
l
.
iiiiiiii'ii'i'i/
. (W
=
c1
A
H
~1—
DlM
A
B
c
0
F
B
H
J
K
L
M
N
Semiconductor Products
MOTOROLA
low, CA2 (CB2)
is
(CB1) (Table 4). When CRA-5 (ORB-5)
CA1
becomes
(CB2)
an
control peripheral data transfers.
and C82
mode, CA2
(Tables and 6).
5
high
is
CA2
transition of High when the
E
"A"
Data CRA—7
is
tion the
of
transition
of High on
E
the "E"
Read "A" Data first
deselect.
during
a
Always low
as 3
Write to low.
MPU Will 90
"A". Write to
that
changes ORA-3
ORA-3 High when ORA-3 goes high
long
as
a result
Control Register"A".
to
CRA—S
PACKAGE DlMENSlONS
CASE 715-02
(CERAMIC)
i
7
i
n
, '
" '
1.
[i3
L
"i
i,"
,
'
~ "J
A
.
_1
'
r
i :
,..1.
....
to}.
..
.
'
SEATING PLANE
'
L
G4ir
MlLLIMETERS INCHES
MAX MIN MAX
MIN
2.020
50.29 51.31 1.980
15.62 0.585 0.615
14.88
4.19 0.100 0.165
2.54
0.38 0.53 0.015 0.021
0.76 1.40 0.030 0.055
880 830
2.54 0.100
0.070
0.70 1.78 0.030
0.013
0.20 0.33 0.008
0165
2.54 4.19 0.100
0.605
0.575
14.80 15.37
100
7 100
—
1.52 0.020 0.060
0.51
A-28
interrupt input line similar
an
is
high, CA2
is
that
may be used
output
signal
When the
in
different characteristics
have slightly
Set
interrupt bit
flag
active transi-
set by
an
CA1 signal.
the
negative edge of
pulse which occurs
ORA-3
long
as as is
high on an MPU
"A"
Control Register
to "one".
as
of
Write
MPU to
an
SEE PAGE 165 FOR
PLASTIC PACKAGE
DIMENSIONS.
1
l
C
N if
\
/
K
oii~J
M
(R
L
NOTE:
LEADS,TRUE POSITIONED WlTHlN
1.
0.25 mm (0.010) DIA (AT SEATING
PLANELAT MAX-MAT'L
CONDITION-
Inc-
to
to
output