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CX82C54 데이터시트(PDF) 5 Page - Intersil Corporation

부품명 CX82C54
상세설명  CMOS Programmable Intervel Timer
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제조업체  INTERSIL [Intersil Corporation]
홈페이지  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

CX82C54 데이터시트(HTML) 5 Page - Intersil Corporation

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5
82C54
Functional Diagram
CONTROL
WORD
REGISTER
READ/
WRITE
LOGIC
DATA/
BUS
BUFFER
COUNTER
2
COUNTER
1
COUNTER
0
INTERNAL BUS
CONTROL
LOGIC
CONTROL
WORD
REGISTER
STATUS
LATCH
STATUS
REGISTER
CLK n
GATE n
OUT n
OUT 2
GATE 2
CLK 2
OUT 1
GATE 1
CLK 1
OUT 0
GATE 0
CLK 0
WR
RD
D7 - D0
A0
A1
CS
OLM
OLL
CE
CRM
CRL
COUNTER INTERNAL BLOCK DIAGRAM
8
Pin Description
SYMBOL
DIP PIN
NUMBER
TYPE
DEFINITION
D7 - D0
1 - 8
I/O
DATA: Bi-directional three-state data bus lines, connected to system data bus.
CLK 0
9
I
CLOCK 0: Clock input of Counter 0.
OUT 0
10
O
OUT 0: Output of Counter 0.
GATE 0
11
I
GATE 0: Gate input of Counter 0.
GND
12
GROUND: Power supply connection.
OUT 1
13
O
OUT 1: Output of Counter 1.
GATE 1
14
I
GATE 1: Gate input of Counter 1.
CLK 1
15
I
CLOCK 1: Clock input of Counter 1.
GATE 2
16
I
GATE 2: Gate input of Counter 2.
OUT 2
17
O
OUT 2: Output of Counter 2.
CLK 2
18
I
CLOCK 2: Clock input of Counter 2.
A0, A1
19 - 20
I
ADDRESS: Select inputs for one of the three counters or Control Word Register for read/write
operations. Normally connected to the system address bus.
CS
21
I
CHIP SELECT: A low on this input enables the 82C54 to respond to RD and WR signals. RD and WR
are ignored otherwise.
RD
22
I
READ: This input is low during CPU read operations.
WR
23
I
WRITE: This input is low during CPU write operations.
VCC
24
-
VCC: The +5V power supply pin. A 0.1µF capacitor between pins VCC and GND is recommended for
decoupling.
A1
A0
SELECTS
0
0
Counter 0
0
1
Counter 1
1
0
Counter 2
1
1
Control Word Register


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