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  NEC Electronic Components Datasheet  

UPD8279-5 Datasheet

PROGRAMMABLE KEYBOARD/DISPLAY INTERFACE

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NEe Microcomputers, Inc.
NEe
fLPD8279·5
PROGRAMMABLE KEYBOARD/DISPLAY
INTERFACE
DESCR IPTION
The ~PD8279-5 is a programmable keyboard and display Input/Output device. It
provides the user with the ability to display data on alphanumeric segment displays
or simple indicators. The display RAM can be programmed as 16 x 8 or a dual
16 x 4 and loaded or read by the host processor. The display can be loaded with
right or left entry with an auto-increment of the display RAM address.
The keyboard interface provides a scanned signal to a 64 contact key matrix expand-
able to 128. General sensors or strobed keys may also be used_ Keystrokes are stored
in an 8 character FIFO and can be either 2 key lockout or N key rollover. Keyboard
entries generate an interrupt to the processor.
FEATURES
Programmable by Processor
• 32 HEX or 16 Alphanumeric Displays
• 64 Expandable to 128 Keyboard
• Simultaneous Keyboard and Display
• 8 Character Keyboard - FIFO
• 2 Key Lockout or N Key Rollover
• Contact Debounce
• Programmable Scan Timer
• Interrupt on Key Entry
• Single +5 'i/olt Supply, ±10%
• Fully Compatible with 8080A, 8085A, ~PD780 (ZOOTM)
• Available in 40 Pin Plastic Package
PIN CONFIGURATION
RL2
RL3
CLK
IRQ
RL4
RLS
RLS
RL7
RESET
RD
WR
DBO
DB1
DB2
DB3
DB4
DBS
DBS
DB7
VSS
~PD
8279-5
VCC
RL1
RLo
CNTL/STB
SHIFT
SL3
SL2
SL1
SLO
OUT BO
OUT B1
OUTB2
OUT B3
OUT -AO
OUTA1
OUT A2
OUT A3
So
CS
AO
PIN NAMES
OBO·7
ClK
RESET
CS
RO
WR
AO
IRQ
SlO-3
RlO-7
SHIFT
CNTllSTS
OUT A0-3
OUT S0-3
1m
Data Bus (Si-directional)
Clock Input
Reset Input
Chip Select
Read Input
Write Input
Buffer Address
Interrupt Request Output
Scan Unes
Return Lil')es
Shift Input
Control/Strobe Input
Display (AI Outputs
Display (BI Outputs
Bland Display Output
II
TM: Z80 is a registered trademark of Zilog.
Rev/1
659


  NEC Electronic Components Datasheet  

UPD8279-5 Datasheet

PROGRAMMABLE KEYBOARD/DISPLAY INTERFACE

No Preview Available !

fLPD8279.S
The /.lPD8279-5 has two basic functions: 1) to control displays to output and 2) to
control a keyboard for input. Its specific purpose is to unburden the host processor
from monitoring keys and refreshing displays. The /.lPD8279-5 is designed to directly
interface the microprocessor bus. The microprocessor must program the operating
mode to the /.lPD8279-5, these modes are as follows:
Output Modes
• 8 or 16 Character Display
• Right or Left Entry
Input Modes
• Scanned Keyboard with Encoded 8 x 8 x 4 Key Format or Decoded 4 x 8 x 8
Scan Lines.
• Scanned Sensor Matrix with Encoded 8 x 8 or Decoded 4 x 8 Scan Lines.
• Strobed Input.
FUNCTIONAL
DESCRIPTION
BLOCK DIAGRAM
elK RESET 080_7
IRO
OUT AO_3 OUT 80-3
SLO_J
CNTLlSTB
Operating Temperature
...... OOC to +70°C
Storage Temperature ......... .
. _65°C to +125°C
All Output Vol tages .. .
. . . . . . . . . . . . . . . . . . .. -0.5 to +7 Volts<D
All Input Voltages. : . . . . . . . . . .
-0.5 to +7 Voits<D
Supply Voltages .... .
-0.5 to +7 Volts<D
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1W
CDNote: With respect to VSS
CO'MMENT: Stress above those listed under "Absolute Maximum Ratings" may cause permanent
damage to the device. This is a stress rating only and functional operation of the device at these or
any other conditions above those indicated in the operational sections of this spe~ifjcation is not
implied. Exposure to absolute maximum rating conditions for extended periods may affect device
reliability.
ABSOLUTE MAXIMUM
RATINGS'
660


Part Number UPD8279-5
Description PROGRAMMABLE KEYBOARD/DISPLAY INTERFACE
Maker NEC
Total Page 9 Pages
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