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NTE6821 Datasheet(PDF) 4 Page - NTE Electronics

Part No. NTE6821
Description  Integrated Circuit Peripheral Interface Adapter (PIA), NMOS, 1MHz
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Maker  NTE [NTE Electronics]
Homepage  http://www.nteinc.com
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NTE6821 Datasheet(HTML) 4 Page - NTE Electronics

   
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R/W
CS2
RESET
IRQB
IRQA
Expanded Block Diagram
Pin Connection Diagram
IRQA
38
D0
33
VCC = PIN20
VSS = PIN1
CS0
22
Data Bus
Buffers
(DBB)
Bus Input
Register
(BIR)
Chip
Select
and
R/W
Control
IRQB
37
Control
Register A
(CRA)
D1
32
D2
31
D3
30
D4
29
D5
28
D6
27
D7
26
CS1
24
CS2
23
RS0
36
RS1
35
R/W
21
Enable
25
Reset
34
Output
Register A
(ORA)
Output
Register B
(ORB)
Control
Register B
(CRB)
Output Bus
Interrupt Status
Control A
Interrupt Status
Control B
Data Direction
Register A
(DDRA)
Data Direction
Register B
(DDRB)
Peripheral
Interface
A
Peripheral
Interface
B
40
CA1
39
CA2
2PA0
3PA1
4PA2
5PA3
6PA4
7PA5
8PA6
9PA7
10
PB0
11
PB1
12
PB2
13
PB3
14
PB4
15
PB5
16
PB6
17
PB7
18
CB1
19
CB2
VCC
VSS
PA4
PA2
PA6
D2
PB1
CS0
CS1
E
D7
D6
D5
D4
D3
D1
D0
RS1
RS0
CA2
PA1
PA0
PA7
PB7
PB2
1
2
3
4
5
PA3
6
7
PA5
8
40
39
38
37
36
35
34
33
9
32
10
PB0
11
31
30
12
29
13
PB3
28
14
PB4
27
CB1
15
PB5
26
16
PB6
17
25
24
18
23
19
CB2
22
20
21
CA1


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