Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.NET

X  

IP82C55A-5 Datasheet(PDF) 3 Page - Intersil Corporation

Part # IP82C55A-5
Description  CMOS Programmable Peripheral Interface
Download  26 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

IP82C55A-5 Datasheet(HTML) 3 Page - Intersil Corporation

  IP82C55A-5 Datasheet HTML 1Page - Intersil Corporation IP82C55A-5 Datasheet HTML 2Page - Intersil Corporation IP82C55A-5 Datasheet HTML 3Page - Intersil Corporation IP82C55A-5 Datasheet HTML 4Page - Intersil Corporation IP82C55A-5 Datasheet HTML 5Page - Intersil Corporation IP82C55A-5 Datasheet HTML 6Page - Intersil Corporation IP82C55A-5 Datasheet HTML 7Page - Intersil Corporation IP82C55A-5 Datasheet HTML 8Page - Intersil Corporation IP82C55A-5 Datasheet HTML 9Page - Intersil Corporation Next Button
Zoom Inzoom in Zoom Outzoom out
 3 / 26 page
background image
3
Functional Description
Data Bus Buffer
This three-state bi-directional 8-bit buffer is used to interface
the 82C55A to the system data bus. Data is transmitted or
received by the buffer upon execution of input or output
instructions by the CPU. Control words and status informa-
tion are also transferred through the data bus buffer.
Read/Write and Control Logic
The function of this block is to manage all of the internal and
external transfers of both Data and Control or Status words.
It accepts inputs from the CPU Address and Control busses
and in turn, issues commands to both of the Control Groups.
(CS) Chip Select. A “low” on this input pin enables the
communcation between the 82C55A and the CPU.
(RD) Read. A “low” on this input pin enables 82C55A to send
the data or status information to the CPU on the data bus. In
essence, it allows the CPU to “read from” the 82C55A.
(WR) Write. A “low” on this input pin enables the CPU to
write data or control words into the 82C55A.
(A0 and A1) Port Select 0 and Port Select 1. These input
signals, in conjunction with the RD and WR inputs, control
the selection of one of the three ports or the control word
register. They are normally connected to the least significant
bits of the address bus (A0 and A1).
(RESET) Reset. A “high” on this input initializes the control
register to 9Bh and all ports (A, B, C) are set to the input
mode. “Bus hold” devices internal to the 82C55A will hold
the I/O port inputs to a logic “1” state with a maximum hold
current of 400
µA.
Group A and Group B Controls
The functional configuration of each port is programmed by
the systems software. In essence, the CPU “outputs” a con-
trol word to the 82C55A. The control word contains
information such as “mode”, “bit set”, “bit reset”, etc., that ini-
tializes the functional configuration of the 82C55A.
Each of the Control blocks (Group A and Group B) accepts
“commands” from the Read/Write Control logic, receives
“control words” from the internal data bus and issues the
proper commands to its associated ports.
Control Group A - Port A and Port C upper (C7 - C4)
Control Group B - Port B and Port C lower (C3 - C0)
The control word register can be both written and read as
shown in the “Basic Operation” table. Figure 4 shows the
control word format for both Read and Write operations.
When the control word is read, bit D7 will always be a logic
“1”, as this implies control word mode information.
82C55A BASIC OPERATION
A1
A0
RD
WR
CS
INPUT OPERATION
(READ)
00010
Port A
→ Data Bus
01010
Port B
→ Data Bus
10010
Port C
→ Data Bus
11010
Control Word
→ Data Bus
OUTPUT OPERATION
(WRITE)
00100
Data Bus
→ Port A
01100
Data Bus
→ Port B
10100
Data Bus
→ Port C
11100
Data Bus
→ Control
DISABLE FUNCTION
XXXX
1
Data Bus
→ Three-State
X
X
1
1
0
Data Bus
→ Three-State
FIGURE 1. 82C55A BLOCK DIAGRAM. DATA BUS BUFFER,
READ/WRITE, GROUP A & B CONTROL LOGIC
FUNCTIONS
GROUP A
PORT A
(8)
GROUP A
PORT C
UPPER
(4)
GROUP B
PORT C
LOWER
(4)
GROUP B
PORT B
(8)
GROUP B
CONTROL
GROUP A
CONTROL
DATA
READ
WRITE
CONTROL
LOGIC
RD
WR
A1
A0
RESET
CS
D7-D0
POWER
SUPPLIES
+5V
GND
BI-DIRECTIONAL
DATA BUS
I/O
PA7-
I/O
PC7-
I/O
PC3-
I/O
PB7-
BUFFER
BUS
PB0
PC0
PC4
PA0
8-BIT
INTERNAL
DATA BUS
82C55A


Similar Part No. - IP82C55A-5

ManufacturerPart #DatasheetDescription
logo
Harris Corporation
IP82C55A-5 HARRIS-IP82C55A-5 Datasheet
234Kb / 26P
   CMOS Programmable Peripheral Interface
More results

Similar Description - IP82C55A-5

ManufacturerPart #DatasheetDescription
logo
Toshiba Semiconductor
TMP82C255A TOSHIBA-TMP82C255A Datasheet
682Kb / 32P
   CMOS PROGRAMMABLE PERIPHERAL INTERFACE
logo
Intersil Corporation
CS82C55AZ96 INTERSIL-CS82C55AZ96 Datasheet
560Kb / 29P
   CMOS Programmable Peripheral Interface
logo
Harris Corporation
82C55A HARRIS-82C55A Datasheet
234Kb / 26P
   CMOS Programmable Peripheral Interface
logo
Intersil Corporation
MS82C55A INTERSIL-MS82C55A_06 Datasheet
500Kb / 26P
   CMOS Programmable Peripheral Interface
MS82C55A INTERSIL-MS82C55A Datasheet
502Kb / 24P
   CMOS Programmable Peripheral Interface
logo
List of Unclassifed Man...
SMC82C55AC-5 ETC1-SMC82C55AC-5 Datasheet
293Kb / 6P
   CMOS PROGRAMMABLE PERIPHERAL INTERFACE
logo
Wing Shing Computer Com...
WS82C55A WINGS-WS82C55A Datasheet
457Kb / 25P
   CMOS Programmable peripheral Interface
logo
Intersil Corporation
82C55A INTERSIL-82C55A_06 Datasheet
554Kb / 29P
   CMOS Programmable Peripheral Interface
logo
Renesas Technology Corp
MS82C55A RENESAS-MS82C55A Datasheet
1Mb / 26P
   CMOS Programmable Peripheral Interface
82C55A RENESAS-82C55A Datasheet
818Kb / 30P
   CMOS Programmable Peripheral Interface
Dec 8, 2015
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.NET
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com