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NEC - PROGRAMMABLE INTERRUPT CONTROLLER

Numéro de référence UPD8259
Description PROGRAMMABLE INTERRUPT CONTROLLER
Fabricant NEC 
Logo NEC 





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UPD8259 fiche technique
NEe Microcomputers, Inc.
~EC
f'PD8259
",PD8259·5
PROGRAMMABLE INTERRUPT CONTROLLER
DESCRIPTION
The NEC pPD8259-5 is a programmable interrupt controller directly compatible with
the 8080A/8085A/pPD780(Z80™). It can service eight levels of interrupts and con-
tains on-chip logic to expand interrupt capabilities up to sixty-four levels with the
addition of other pPD8259-5's. The user is offered a selection of priority algorithms to
tailor the priority processing to meet his systems requirements. These algorithms can
be dynamically modified during operation, expanding the versatility of the micro-
processor system.
F EATUR ES
NEC now Supplies pPD8259-5 to pPD8259 Requirements
• Eight Level Priority Controller
• Programmable Base Vector Address
• Expandable to 64 Levels
• Programmable Interrupt Modes (Algorithms)
• Individual Request Mask Capability
• Single +5V Supply ±10% (No Clocks)
• Full Compatibility with 8080A
• pPD8259-5 Compatible with 8085A Speeds
• Available in 28 Pin Plastic and Ceramic Packages
PIN CONFIGURATION
cs
WR
RD
D7
DS
D5
D4
D3
D2
D1
DO
CASO
CAS1
GNQ
VCC
AO
iNTA
IR7
IRS
IR5
IR4
IR3
IR2
IR1
IRO
INT
SP
CAS 2
PIN NAMES
D7 - DO
RD
WR
AO
CAS2- CASO
SP
INT
INTA
IRO-IR7
l:§"
Data Bus (Bi-Directional)
Read Input
Write input
Command Select Address
Cascade Lines
Slave Program Input
Interrupt Output
Interrupt Acknowledge Input
Interrupt Request Inputs
Chip Select
II
TM: Z80 is a registered trademark of Zilog, Inc.
625

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