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What is 87C51F?

This electronic component, produced by the manufacturer "Intel Corporation", performs the same function as "CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER".


87C51F Datasheet PDF - Intel Corporation

Part Number 87C51F
Description CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER
Manufacturers Intel Corporation 
Logo Intel Corporation Logo 


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87C51FA 87C51FB 87C51FC 87C51FC-20
CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER
Automotive
Y FX Core Architecture Device
Y Extended Automotive Temperature
Range (b40 C to a125 C Ambient)
Y Available in 12 MHz 16 MHz and
20 MHz Versions
Y High Performance CHMOS EPROM
Y Three 16-Bit Timer Counters
Timer 2 (Up Down Counter)
Y Programmable Counter Array with
High Speed Output
Compare Capture
Pulse Width Modulator
Watchdog Timer Capabilities
Y One-to-Three Level Program Lock
System on EPROM
Y 8K On-Chip User Programmable
EPROM in 87C51FA
Y 16K On-Chip User Programmable
EPROM in 87C51FB
Y 32K On-Chip User Programmable
EPROM in 87C51FC
Y 256 Bytes of On-Chip Data RAM
Y Quick Pulse Programming Algorithm
Y Boolean Processor
Y 32 Programmable I O Lines
Y 7 Interrupt Sources
Y Four Level Interrupt Priority
Y Programmable Serial Channel with
Framing Error Detection
Automatic Address Recognition
Y TTL and CMOS Compatible Logic
Levels
Y 64K External Program Memory Space
Y 64K External Data Memory Space
Y MCS -51 Fully Compatible Instruction
Set
Y Power Saving Idle and Power Down
Modes
Y ONCE (On-Circuit Emulation) Mode
Y RFI Reduction Mode
Y Available in PLCC and PDIP Packages
MEMORY ORGANIZATION
PROGRAM MEMORY Up to 8 Kbytes of the program memory can reside in the 87C51FA On-Chip EPROM
Up to 16 Kbytes of the program memory can reside in the 87C51FB on-chip EPROM Up to 32 Kbytes of the
program memory can reside in the 87C51FC on-chip EPROM In addition the device can address up to 64K of
program memory external to the chip
DATA MEMORY This microcontroller has a 256 x 8 on-chip RAM In addition it can address up to 64 Kbytes of
external data memory
The Intel 87C51FA 87C51FB 87C51FC is a single-chip control-oriented microcontroller which is fabricated on
Intel’s reliable CHMOS EPROM technology Being a member of the MCS-51 family the 87C51FB 87C51FC
uses the same powerful instruction set has the same architecture and is pin-for-pin compatible with the
existing MCS-51 family of products The 87C51FA is an enhanced version of the 87C51 The 87C51FB is an
enhanced version of the 87C51FA The 87C51FC is an enhanced version of the 87C51FB With 8 Kbytes of
program memory in the 87C51FA and 16 Kbytes of program memory in the 87C51FB and 32 Kbytes of
program memory in the 87C51FC it is an even more powerful microcontroller for applications that require
Pulse Width Modulation High Speed I O and up down counting capabilities such as brake and traction
control
For the remainder of this document the 87F51FA 87C51FB and 87C51FC will be referred to as the
87C51FA FB FC
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
September 1993
Order Number 270961-003

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87C51F equivalent
AUTOMOTIVE 87C51FA FB FC FC-20
Port 2 emits the high-order address byte during
fetches from external Program Memory and during
accesses to external Data Memory that use 16-bit
addresses (MOVX DPTR) In this application it
uses strong internal pullups when emitting 1’s Dur-
ing accesses to external Data Memory that use 8-bit
addresses (MOVX Ri) Port 2 emits the contents
of the P2 Special Function Register
Some Port 2 pins receive the high-order address bits
during EPROM programming and program verifica-
tion
Port 3 Port 3 is an 8-bit bidirectional I O port with
internal pullups The Port 3 output buffers can drive
LS TTL inputs Port 3 pins that have 1’s written to
them are pulled high by the internal pullups and in
that state can be used as inputs As inputs Port 3
pins that are externally pulled low will source current
(IIL on the data sheet) because of the pullups
Port 3 also serves the functions of various special
features of the MCS-51 Family as listed below
Port Pin
Alternate Function
P3 0
P3 1
P3 2
P3 3
P3 4
P3 5
P3 6
P3 7
RXD (serial input port)
TXD (serial output port)
INT0 (external interrupt 0)
INT1 (external interrupt 1)
T0 (Timer 0 external input)
T1 (Timer 1 external input)
WR (external data memory write strobe)
RD (external data memory read strobe)
RST Reset input A high on this pin for two machine
cycles while the oscillator is running resets the de-
vice The port pins will be driven to their reset condi-
tion when a minimum VIH1 is applied whether the
oscillator is running or not An internal pulldown re-
sistor permits a power-on reset with only a capacitor
connected to VCC
ALE PROG Address Latch Enable output pulse for
latching the low byte of the address during accesses
to external memory This pin (ALE PROG) is also
the program pulse input during EPROM program-
ming for the 87C51FA FB FC
In normal operation ALE is emitted at a constant
rate of the oscillator frequency and may be used
for external timing or clocking purposes Note how-
ever that one ALE pulse is skipped during each ac-
cess to external Data Memory
Throughout the remainder of this data sheet ALE
will refer to the signal coming out of the ALE PROG
pin and the pin will be referred to as the ALE PROG
pin
PSEN Program Store Enable is the read strobe to
external Program Memory
When the 87C51FA FB FC is executing code from
external Program Memory PSEN is activated twice
each machine cycle except that two PSEN activa-
tions are skipped during each access to external
Data Memory
EA VPP External Access enable EA must be
strapped to VSS in order to enable the device to
fetch code from external Program Memory locations
0000H to 0FFFFH Note however that if either of
the Program Lock bits are programmed EA will be
internally latched on reset
EA should be strapped to VCC for internal program
executions
This pin also receives the programming supply volt-
age (VPP) during EPROM programming
XTAL1 Input to the inverting oscillator amplifier
XTAL2 Output from the inverting oscillator amplifier
OSCILLATOR CHARACTERISTICS
XTAL1 and XTAL2 are the input and output respec-
tively of an inverting amplifier which can be config-
ured for use as an on-chip oscillator as shown in
Figure 4 Either a quartz crystal or ceramic resonator
may be used More detailed information concerning
the use of the on-chip oscillator is available in Appli-
cation Note AP-155 ‘‘Oscillators for Microcontrol-
lers’’ and in Application Note AP-486 ‘‘Oscillator
Design for Microcontrollers’’
5


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