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PDF UPD8279-5 Data sheet ( Hoja de datos )
| Número de pieza | UPD8279-5 | |
| Descripción | PROGRAMMABLE KEYBOARD/DISPLAY INTERFACE | |
| Fabricantes | NEC | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de UPD8279-5 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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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
1 page  
TIMING WAVEFORMS
INPUT FOR AC TESTS
2.4
0.45
fl-PD8279·S
READ
BUS)AO. cs-....,,.------------"""i6c"---------ISYSTEM·S
_Jt::;;:+=======::;;:;;=::1~====;_----ADOAeSS
(READ CONTROL)
O A T A B U S - - - - - - - - - + - - - - - - - - 1 r - - - - - - -__-
IOUTPUTI _ _~~~~~_ _~------~-----------
WRITE
AO. cs -_-...'....r,.-_-_--_-_--_-----'""Ij.,---------(SYSTEM'S_______~.~---------AOORESSBUSI
(WRITE CONTROL)
OATABUS--------""~~----~~,----------
f1NPUT)
DATA MAY CHANGE
CLOCK INPUT
II
663
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet UPD8279-5.PDF ] | |
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