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Intel Corporation
Intel Corporation


80C31BH

CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER



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80C31BH pdf
80C31BH 80C51BH 87C51
MCS 51
CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER
Automotive
Y Extended Automotive Temperature
Range (b40 C to a125 C Ambient)
Y High Performance CHMOS Process
Y Power Control Modes
Y 4 Kbyte On-Chip ROM EPROM
Y 128 x 8-bit RAM
Y 32 Programmable I O Lines
Y Two 16-Bit Timer Counters
Y 5 Interrupt Sources
Y Quick-Pulse EPROM Programming
Y 2-Level Program Memory Lock EPROM
Y Boolean Processor
Y Programmable Serial Port
Y TTL- and CMOS-Compatible Logic
Levels
Y 64K External Program Memory Space
Y 64K External Data Memory Space
Y IDLE and POWER DOWN Modes
Y ONCE Mode Facilitates System Testing
Y Available in 12 MHz and 16 MHz
Versions
Y Available in PLCC and DIP Packages
(See Packaging Specification Order 231369)
The MCS 51 CHMOS microcontroller products are fabricated on Intel’s reliable CHMOS process and are
functionally compatible with the standard MCS 51 HMOS microcontroller products This technology combines
the high speed and density characteristics of HMOS with the low power attributes of CHMOS This combina-
tion expands the effectiveness of the powerful MCS 51 microcontroller architecture and instruction set
Like the MCS 51 HMOS microcontroller versions the MCS 51 CHMOS microcontroller products have the
following features 4 Kbytes of EPROM ROM (87C51 80C51BH respectively) 128 bytes of RAM 32 I O lines
two 16-bit timer counters a five-source two-level interrupt structure a full duplex serial port and on-chip
oscillator and clock circuitry In addition the MCS 51 CHMOS microcontroller products exhibit low operating
power along with two software selectable modes of reduced activity for further power reduction Idle and
Power Down
The Idle mode freezes the CPU while allowing the RAM timer counters serial port and interrupt system to
continue functioning The Power Down mode saves the RAM contents but freezes the oscillator causing all
other chip functions to be inoperative
The 87C51 is the EPROM version of the 80C51BH It contains 4 Kbytes of on-chip program memory that can
be electrically programmed and can be erased by exposure to ultraviolet light The 87C51 EPROM array uses
a modified Quick-Pulse Programming algorithm by which the entire 4 Kbyte array can be programmed in about
12 seconds
NOTICE
This datasheet contains information on products in full production Specifications within this datasheet
are subject to change without notice Verify with your local Intel sales office that you have the latest
datasheet before finalizing a design
Other brands and names are the property of their respective owners
Information in this document is provided in connection with Intel products Intel assumes no liability whatsoever including infringement of any patent or
copyright for sale and use of Intel products except as provided in Intel’s Terms and Conditions of Sale for such products Intel retains the right to make
changes to these specifications at any time without notice Microcomputer Products may have minor variations to this specification known as errata
COPYRIGHT INTEL CORPORATION 1995
January 1995
Order Number 270419-007



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80C31BH pdf
AUTOMOTIVE 80C31BH 80C51BH 87C51
Figure 1 MCS 51 Microcontroller Architectural Block Diagram
270419 – 1
2



Part Number 80C31BH
Description CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER
Maker Intel Corporation - Intel Corporation
Total Page 16 Pages
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