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changes to these specifications at any time without notice Microcomputer Products may have minor variations to this specification known as errata

January 1995

COPYRIGHT

INTEL CORPORATION 1995

Order Number 270419-007

80C31BH80C51BH87C51

MCS

51

CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER

Automotive

Y

Extended Automotive Temperature

Y

High Performance CHMOS Process

Y

Power Control Modes

Y

4 Kbyte On-Chip ROMEPROM

Y

128 x 8-bit RAM

Y

32 Programmable IO Lines

Y

Two 16-Bit TimerCounters

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 EPROMROM (87C5180C51BH respectively) 128 bytes of RAM 32 IO lines

two 16-bit timercounters 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 reductionIdle and

Power Down

The Idle mode freezes the CPU while allowing the RAM timercounters 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