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NSC800D-3I-NSC800N-1-NSC800N-3I-NSC800N-4I-NSC800V-4I
High-performance low-power CMOS microprocessor, 3.0 MHz
TL/C/5171
NSC800
High-Performance
Low-Power
CMOS
Microprocessor
June 1992
NSC800TM High-Performance
Low-Power CMOS Microprocessor
General Description
The NSC800isan 8-bit CMOS microprocessor that func-
tionsasthe central processingunit (CPU)in National Semi-
conductor’s NSC800 microcomputer family. National’s
microCMOS technology usedto fabricatethis device pro-
vides system designers with performance equivalentto
comparable NMOS products,but withthelow power advan-
tageof CMOS. Someof themany system functions incorpo-
ratedonthe device,are vectored priority interrupts, refresh
control, power-save featureand interrupt acknowledge.The
NSC800is availablein dual-in-line and surface mounted
chip carrier packages.
The system designercan choosenot only fromthe dedicat- CMOS peripherals that allow direct interfacingtothe
NSC800but fromthefulllineof National’s CMOS products allowa low-power system solution.Thededicated periph-
erals include NSC810A RAM I/O Timer, NSC858 UART,
and NSC831 I/O.
All devicesare availablein commercial, industrialand mili-
tary temperature ranges along with two added reliability
flows.Thefirstisan extended burnintestandthe secondis
the military classC screeningin accordance with Method
5004of MIL-STD-883.
Features Fully compatible with Z80É instructionset:
Powerfulsetof158 instructions addressing modes internal registers Low power:50 mWat5V VCC Unique power-save feature Multiplexedbus structure Schmitt trigger inputon reset On-chipbus controllerand clock generator Variable power supply 2.4Vb6.0V On-chip 8-bit dynamic RAM refresh circuitry Speed:1.0ms instruction cycleat4.0 MHz
NSC800-4 4.0 MHz
NSC800-35 3.5 MHz
NSC800-3 2.5 MHz
NSC800-1 1.0 MHz Capableof addressing 64k bytesof memory and 256
I/O devices Five interrupt request lines on-chip
Block Diagram
TL/C/5171–73
NSC800TMisatrademark ofNationalSemiconductorCorp.
TRI-STATEÉ isaregistered trademarkof National SemiconductorCorp.
Z80Éisaregistered trademarkof ZilogCorp.
C1995National SemiconductorCorporation RRD-B30M105/PrintedinU.S.A.
