NSC800 Datasheet, PDF (1/76 Pages) National Semiconductor (TI) – NSC800TM High-Performance Low-Power CMOS Microprocessor

June 1992
NSC800^TM High-Performance
Low-Power CMOS Microprocessor
General Description
The NSC800 is an 8-bit CMOS microprocessor that func-
tions as the central processing unit (CPU) in National Semi-
conductor’s NSC800 microcomputer family National’s
microCMOS technology used to fabricate this device pro-
vides system designers with performance equivalent to
comparable NMOS products but with the low power advan-
tage of CMOS Some of the many system functions incorpo-
rated on the device are vectored priority interrupts refresh
control power-save feature and interrupt acknowledge The
NSC800 is available in dual-in-line and surface mounted
chip carrier packages
The system designer can choose not only from the dedicat-
ed CMOS peripherals that allow direct interfacing to the
NSC800 but from the full line of National’s CMOS products
to allow a low-power system solution The dedicated periph-
erals include NSC810A RAM I O Timer NSC858 UART
and NSC831 I O
All devices are available in commercial industrial and mili-
tary temperature ranges along with two added reliability
flows The first is an extended burn in test and the second is
the military class C screening in accordance with Method
5004 of MIL-STD-883
Features
Y _{Fully compatible with Z80 instruction set}
Powerful set of 158 instructions
10 addressing modes
22 internal registers
Y _{Low power 50 mW at 5V VCC}
Y _{Unique power-save feature}
Y _{Multiplexed bus structure}
Y _{Schmitt trigger input on reset}
Y _{On-chip bus controller and clock generator}
Y _{Variable power supply 2 4V}b_{6 0V}
Y _{On-chip 8-bit dynamic RAM refresh circuitry}
Y _{Speed 1 0 ms instruction cycle at 4 0 MHz}
NSC800-4 4 0 MHz
NSC800-35 3 5 MHz
NSC800-3 2 5 MHz
NSC800-1 1 0 MHz
Y _{Capable of addressing 64k bytes of memory and 256}
I O devices
Y _{Five interrupt request lines on-chip}
Block Diagram
NSC800TM is a trademark of National Semiconductor Corp
TRI-STATE is a registered trademark of National Semiconductor Corp
Z80 is a registered trademark of Zilog Corp
C1995 National Semiconductor Corporation TL C 5171
TL C 5171 – 73
RRD-B30M105 Printed in U S A