Datenblatt-pdf.com


87C51FB Schematic ( PDF Datasheet ) - Intel Corporation

Teilenummer 87C51FB
Beschreibung CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLERS
Hersteller Intel Corporation
Logo Intel Corporation Logo 




Gesamt 18 Seiten
87C51FB Datasheet, Funktion
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






87C51FB Datasheet, Funktion
AUTOMOTIVE 87C51FA FB FC FC-20
To drive the device from an external clock source
XTAL1 should be driven while XTAL2 floats as
shown in Figure 5 There are no requirements on the
duty cycle of the external clock signal since the in-
put to the internal clocking circuitry is through a di-
vide-by-two flip-flop but minimum and maximum
high and low times specified on the data sheet must
be observed
An external oscillator may encounter as much as
100 pF load at XTAL1 when it starts up This is due
to interaction between the amplifier and its feedback
capacitance Once the external signal meets VIL and
VIH specifications the capacitance will not exceed
20 pF
270961 – 5
C1 C2 e 30 pF g10 pF for Crystals
For Ceramic Resonators contact resonator manufac-
turer
Figure 4 Oscillator Connections
270961 – 6
Figure 5 External Clock Drive Configuration
IDLE MODE
The user’s software can invoke the Idle Mode When
the microcontroller is in this mode power consump-
tion is reduced The Special Function Registers and
the onboard RAM retain their values during Idle but
the processor stops executing instructions Idle
Mode will be exited if the chip is reset or if an en-
abled interrupt occurs The PCA timer counter can
optionally be left running or paused during Idle
Mode
POWER DOWN MODE
To save even more power a Power Down mode can
be invoked by software In this mode the oscillator
is stopped and the instruction that invoked Power
Down is the last instruction executed The on-chip
RAM and Special Function Registers retain their val-
ues until the Power Down mode is terminated
On the 87C51FA FB FC either a hardware reset or
external interrupt can cause an exit from Power
Down Reset redefines all the SFRs but does not
change the on-chip RAM An external interrupt al-
lows both the SFRs and the on-chip RAM to retain
their values
To properly terminate Power Down the reset or ex-
ternal interrupt should not be executed before VCC is
restored to its normal operating level and must be
held active long enough for the oscillator to restart
and stabilize (normally less than 10 ms)
With an external interrupt INT0 or INT1 must be en-
abled and configured as level-sensitive Holding the
pin low restarts the oscillator (the oscillator must be
allowed time to stabilize after start up before this pin
is released high) but bringing the pin back high com-
pletes the exit Once the interrupt is serviced the
next instruction to be executed after RETI will be the
one following the instruction that put the device into
Power Down
6

6 Page









87C51FB pdf, datenblatt
AUTOMOTIVE 87C51FA FB FC FC-20
EXTERNAL PROGRAM MEMORY READ CYCLE
EXTERNAL DATA MEMORY READ CYCLE
270961 – 12
EXTERNAL DATA MEMORY WRITE CYCLE
270961 – 13
270961 – 14
12

12 Page





SeitenGesamt 18 Seiten
PDF Download[ 87C51FB Schematic.PDF ]

Link teilen




Besondere Datenblatt

TeilenummerBeschreibungHersteller
87C51FCHMOS SINGLE-CHIP 8-BIT MICROCONTROLLERIntel Corporation
Intel Corporation
87C51FACHMOS SINGLE-CHIP 8-BIT MICROCONTROLLERIntel Corporation
Intel Corporation
87C51FA80C51 8-bit microcontroller family 8K.64K/256.1K OTP/ROM/ROMless/ low voltage 2.7V.5.5V/ low power/ high speed 33 MHzNXP Semiconductors
NXP Semiconductors
87C51FA80C51 8-bit microcontroller family 8K.64K/256.1K OTP/ROM/ROMless/ low voltage 2.7V.5.5V/ low power/ high speed 33 MHzNXP Semiconductors
NXP Semiconductors
87C51FACHMOS SINGLE-CHIP 8-BIT MICROCONTROLLERSIntel Corporation
Intel Corporation

TeilenummerBeschreibungHersteller
CD40175BC

Hex D-Type Flip-Flop / Quad D-Type Flip-Flop.

Fairchild Semiconductor
Fairchild Semiconductor
KTD1146

EPITAXIAL PLANAR NPN TRANSISTOR.

KEC
KEC


www.Datenblatt-PDF.com       |      2020       |      Kontakt     |      Suche