87C51FA/87C51FB/87C51FC/87C51FC-20
CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER
Automotive
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FX Core Architecture Device
Extended Automotive Temperature
Range (
-
40
°
C to
+
125
°
C Ambient)
Available in 12 MHz, 16 MHz and
20 MHz Versions
High Performance CHMOS EPROM
Three 16-Bit Timer/Counters
• Timer 2 (Up/Down Counter)
Programmable Counter Array with:
• High Speed Output,
• Compare/Capture,
• Pulse Width Modulator,
• Watchdog Timer Capabilities
One-to-Three Level Program Lock
System on EPROM
8K On-Chip User Programmable
EPROM in 87C51FA
16K On-Chip User Programmable
EPROM in 87C51FB
32K On-Chip User Programmable
EPROM in 87C51FC
256 Bytes of On-Chip Data RAM
Quick Pulse Programming Algorithm
Boolean Processor
32 Programmable I/O Lines
7 Interrupt Sources
Four Level Interrupt Priority
Programmable Serial Channel with:
• Framing Error Detection
• Automatic Address Recognition
TTL and CMOS Compatible Logic
Levels
64K External Program Memory Space
64K External Data Memory Space
MCS
®
-51 Fully Compatible Instruction
Set
Power Saving Idle and Power Down
Modes
ONCE (On-Circuit Emulation) Mode
RFI Reduction Mode
Available in PLCC and PDIP Packages
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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, 2004
Order Number: 270961-00
4
July 2004
AUTOMOTIVE 87C51FA/FB/FC/FC-20
270961 ±1
Figure 1. 87C51FB/FC Block Diagram
87C51FA/FB/FC PRODUCT OPTIONS
Intel's extended and automotive temperature range
products are designed to meet the needs of those
applications whose operating requirements exceed
commercial standards.
With the commercial standard temperature range,
operational characteristics are guaranteed over the
temperature range of 0 C to 70 C ambient. With the
extended temperature range option, operational
characteristics are guaranteed over the temperature
2
AUTOMOTIVE 87C51FA/FB/FC/FC-20
range of
-
40
°
C to
+
85
˚
C ambient. For the automo-
tive temperature range option, operational charac-
teristics are guaranteed over the temperature range
of
-
40
˚
C to
+
125
˚
C ambient. The automotive, ex-
tended, and commercial temperature versions of the
MCS-51 product families are available with or with-
out burn-in options.
As shown in Figure 2 temperature, burn-in, and
package options are identified by a one- or two-letter
prefix to the part number.
PIN DESCRIPTIONS
V
CC
:
Supply voltage.
V
SS
:
Circuit ground.
V
SS1
:
Secondary ground (in PLCC only). Provided to
reduce ground bounce and improve power supply
by-passing.
NOTE:
This pin is NOT a substitute for V
SS
pin (pin 22).
Port 0:
Port 0 is an 8-bit, open drain, bidirectional
I/O port. As an output port each pin can sink several
LS TTL inputs. Port 0 pins that have 1’s written to
them float, and in that state can be used as high-im-
pedance inputs.
x
x
x
x
270961 – 2
Figure 2. Package Options
Table 1. Temperature Options
Temperature
Classification
Extended
Automotive
Temperature
Designation
x
x
x
x
Operating
Temperature
°
C Ambient
-
40 to
+
85
-
40 to
+
85
-
40 to
+
125
-
40 to
+
125
Burn-In
Options
Standard
Extended
Standard
Extended
3
AUTOMOTIVE 87C51FA/FB/FC/FC-20
Port 0 is also the multiplexed low-order address and
data bus during accesses to external Program and
Data Memory. In this application it uses strong inter-
nal pullups when emitting 1's, and can source and
sink several LS TTL inputs.
Port 0 also receives the code bytes during EPROM
programming, and outputs the code bytes during
program verification. External pullup resistors are re-
quired during program verification.
Port 1:
Port 1 is an 8-bit bidirectional I/O port with
internal pullups. The Port 1 output buffers can drive
LS TTL inputs. Port 1 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 1
pins that are externally pulled low will source current
(IIL, on the data sheet) because of the internal pull-
ups.
In addition, Port 1 serves the functions of the follow-
ing special features of the 87C51FB/FC:
Port Pin
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
Alternate Function
T2 (External Count Input to
Timer/Counter 2)
T2EX (Timer/Counter 2 Capture/
Reload Trigger and Direction Control)
ECI (External Count Input to the PCA)
CEX0 (External I/O for Compare/
Capture Module 0)
CEX1 (External I/O for Compare/
Capture Module 1)
CEX2 (External I/O for Compare/
Capture Module 2)
CEX3 (External I/O for Compare/
Capture Module 3)
CEX4 (External I/O for Compare/
Capture Module 4)
PACKAGES
Part
87C51FA/FB/FC
Package Type
40-Pin Plastic DIP
44-Pin PLCC
DIP
270961 ±3
PAD (PLCC)
Port 1 receives the low-order address bytes during
EPROM programming and verifying.
Port 2:
Port 2 is an 8-bit bidirectional I/O port with
internal pullups. The Port 2 output buffers can drive
LS TTL inputs. Port 2 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 2
pins that are externally pulled low will source current
(IIL, on the data sheet) because of the internal pull-
ups.
*EPROM
only
**Do not connect reserved pins.
270961 ±4
Diagrams are for pin reference only. Package sizes are
not to scale.
Figure 3. Pin Connections (Top View)
4
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
(I
IL
, 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
P3.0
P3.1
P3.2
P3.3
P3.4
P3.5
P3.6
P3.7
Alternate Function
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)
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/V
PP
:
External Access enable. EA must be
strapped to V
SS
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 V
CC
for internal program
executions.
This pin also receives the programming supply volt-
age (V
PP
) during EPROM programming.
XTAL1:
Input to the inverting oscillator amplifier.
XTAL2:
Output from the inverting oscillator amplifier.
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 V
IH1
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 V
CC
.
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.
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''.
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