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Integral

IN82C55AN Datasheet Preview

IN82C55AN Datasheet

CHMOS PROGRAMMABLE PERIPHERAL INTERFACE

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IN82C55AN
CHMOS PROGRAMMABLE PERIPHERAL INTERFACE
The Integral IN82C55AN is a high-performance, CHMOS version of the industry standard
IN82C55AN general purpose programmable I/O device which is designed for use with all
Intel and most other microprocessors. It provides 24 I/O pins which may be individually
programmed in 2 groups of 12 and used in 3 major modes of operation.
In MODE 0, each group of 12 I/O pins may be programmed in sets of 4 and 8 to be inputs
or outputs. In MODE 1, each group may be programmed to have 8 lines of input or output.
3 of the remaining 4 pins are used for handshaking and interrupt control signals. MODE 2
is a strobed bi-directional bus configuration.
FEATURES
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Compatible with all Intel and Most Other Microprocessors
High Speed, «Zero Wait State» Operation with 8MHz 8086/88 and 80186/188
24 Programmable I/O Pins
Low Power CHMOS
Completely TTL Compatible
Control Word Read-Back Capability
Direct Bit Set/Reset Capability
2.5mA DC Drive Capability on all I/O Port Outputs
Available in 40-Pin DIP
Available in EXPRESS
ƒ Standard Temperature Range
ƒ Extended Temperature Range
GROUP
A
CONTROL
D7-D0
DATA
BUS
BUFFER
8 BIT
INTERNAL
DATA BUS
RD
WR
A1
A0
Reset
CS
READ/
WRITE
CONTROL
LOGIC
GROUP
B
CONTROL
Figure 1
GROUP
A
PORT
A
(8)
GROUP
A
PORT C
UPPER
(4)
GROUP
B
PORT C
LOWER
(4)
GROUP
B
PORT
B
(8)
PA7-PA0
PC7-PC4
PC3-PC0
PB7-PB0
PA3
PA2
PA1
PA0
RD
CS
VSS
A1
A0
PC7
PC6
PC5
PC4
PC0
PC1
PC2
PC3
PB0
PB1
PB2
1. 40
2. 39
3. 38
4. 37
5. 36
6. 35
7. 34
8. 33
9. 32
10 31
11 30
12 29
13 28
14 27
15 26
16 25
17 24
18 23
19 22
20 21
Figure 2
PA4
PA5
PA6
PA7
WR
Reset
D0
D1
D2
D3
D4
D5
D6
D7
VCC
PB7
PB6
PB5
PB4
PB3
1




Integral

IN82C55AN Datasheet Preview

IN82C55AN Datasheet

CHMOS PROGRAMMABLE PERIPHERAL INTERFACE

No Preview Available !

IN82C55AN
Symbol
PA3-0
RD
CS
GND
A1-0
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PC7-4
PC0-3
PB0-7
VCC
D7-0
RESET
WR
PA7-4
Pin
number
1-4
5
6
7
8-9
10-13
14-17
18-25
26
27-34
35
36
37-40
Type
I/O
I
I
I
I/O
I/O
I/O
I/O
I
I
I/O
Name and Function
PORT A, PINS 0-3: Lower nibble of an 8-bit data output latch
buffer and an 8-bit data input latch.
READ CONTROL: This input is low during CPU read
operations.
CHIP SELECT: A low on this input enables the 82C55A to
respond to RD and WR signals RD and WR are ignored
otherwise.
System Ground.
ADDRESS: These input signals in conjunction RD and WR
control the selection of one of the three ports or the control
word registers.
A1 A0 RD WR CS Input Operation (Read)
0 0 0 1 0 Port A - Data Bus
0 1 0 1 0 Port B - Data Bus
1 0 0 1 0 Port C - Data Bus
1 1 0 1 0 Control Word - Data Bus
Output Operation (Write)
0 0 1 0 0 Data Bus - Port A
0 1 1 0 0 Data Bus - Port B
1 0 1 0 0 Data Bus - Port C
1 1 1 0 0 Data Bus – Control
Disable Function
x x x x 1 Data Bus-3-State
x x 1 1 0 Data Bus-3-State
PORT C, PINS 4-7: Upper nibble of an 8-bit data output
latch/buffer and an 8-bit data input buffer (no latch for input).
This port can be divided into two 4-bit ports under the mode
control. Each 4-bit port contains a 4-bit latch and it can be used
for the control signal outputs and status signal inputs in
conjunction with ports A and B.
PORT C, PINS 0-3: Lower nibble of Port C.
PORT B, PINS 0-7: An 8-bit data output latch/buffer and an 8-
bit data input buffer
SYSTEM POWER: +5V Power Supply
DATA BUS: Bi-directional, tri-state data bus lines, connected to
system data bus
RESET: A high on this input clears the control register and all
ports are set to the input mode
WRITE CONTROL: This input is low during CPU write
operations
PORT A PINS 4-7: Upper nibble of an 8-bit data output
latch/buffer and an 8-bit data input latch
2


Part Number IN82C55AN
Description CHMOS PROGRAMMABLE PERIPHERAL INTERFACE
Maker Integral
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