ADC0803, ADC0804
IRQ (4)† [D]††
R/W (34) [6]
10µF
10K
ADC0803 - ADC0804
+
1
2
3
4
5
6
7
8
9
CS
V+ 20
A B C
RD
CLK R
19
18
17
16
15
14
5V (8) 1 2 3
LSB
DB
DB
DB
DB
DB
WR
D
D
D
D
D
D
D
D
(33) [31]
(32) [29]
(31) [K]
(30) [H]
(29) [32]
(28) [30]
(27) [L]
(26) [J]
0
1
2
3
4
0
1
2
3
4
5
6
7
CLK IN
INTR
RD
RD
ANALOG
INPUTS
2
3
V
V
(+)
(-)
IN
IN
IORQ
WR
ADC0803-
ADC0804
AGND
/2
DB 13
5
DB 12
6
V
REF
150pF
MSB
10 DGND
DB 11
7
WR
1
2
3
4
74C32
A
A
A
A
(22) [34]
(23) [N]
(24) [M]
(25) [33]
12
13
14
15
6
1
/
DM8092
2
5
VMA (5) [F]
† Numbers in parentheses refer to MC6800 CPU Pinout.
†† Numbers or letters in brackets refer to standard MC6800 System Common Bus Code.
FIGURE 22. MAPPING THE A/D AS AN
I/O DEVICE FOR USE
FIGURE 23. ADC080X TO MC6800 CPU INTERFACE
WITH THE Z-80 CPU
18
CB
CB
1
2
19
10K
ADC0803 - ADC0804
MC6820
(MCS6520)
1
2
3
4
5
6
7
8
9
CS
V+ 20
5V
RD
CLK R
PIA
19
18
17
16
15
14
10
11
12
13
14
15
16
17
LSB
DB
DB
DB
DB
DB
PB
WR
0
1
2
3
4
0
1
2
3
4
5
6
7
PB
PB
PB
PB
PB
PB
PB
CLK IN
INTR
V
V
(+)
(-)
IN
IN
ANALOG
INPUTS
AGND
/2
DB 13
5
DB 12
6
V
REF
150pF
MSB
10 DGND
DB 11
7
FIGURE 24. ADC080X TO MC6820 PIA INTERFACE
15
INTERSIL [ Intersil ]
