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부품번호 M87C51FC 기능
기능 CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER WITH 32 KBYTES USER PROGRAMMABLE EPROM
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M87C51FC 데이터시트, 핀배열, 회로
M87C51FC
CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER
WITH 32 KBYTES USER PROGRAMMABLE EPROM
Military
M87C51FC 3 5 MHz to 12 MHz VCC e 5Vg20%
M87C51FC-1 3 5 MHz to 16 MHz VCC e 5Vg20%
Y High Performance CHMOS EPROM
Y Three 16-Bit Timer Counters
Y Programmable Clock Out
Y Programmable Counter Array with
High Speed Output
Compare Capture
Pulse Width Modulator
Watchdog Timer Capabilities
Y Up Down Timer Counter
Y Three Level Program Lock System
Y 32K On-Chip EPROM
Y 256 Bytes of On-Chip Data RAM
Y Improved Quick Pulse Programming
Algorithm
Y Boolean Processor
Y Available in 40-pin Cerdip and 44-pin
LCC Packages
Y 32 Programmable I O Lines
Y 7 Interrupt Sources
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 Available in Two Product Grades
MIL-STD-883 b55 C to a125 C (TC)
Military Temperature Only (MTO)
b55 C to a125 C (TC)
MEMORY ORGANIZATION
PROGRAM MEMORY Up to 32 Kbytes of the program memory can reside in the 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 M87C51FC is a single-chip control-oriented microcontroller which is fabricated on Intel’s reliable
CHMOS III-E technology Being a member of the MCS-51 family the M87C51FC 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 M87C51FC is an enhanced version of the 87C51 Its added features make it an even more
powerful microcontroller for applications that require Pulse Width Modulation High Speed I O and up down
counting capabilities such as motor control It also has a more versatile serial channel that facilitates multi-
processor communications
January 1994
Order Number 271114-004




M87C51FC pdf, 반도체, 판매, 대치품
M87C51FC
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 being pulled low will source
current (IIL on the data sheet) because of the pull-
ups
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)
Some Port 3 pins receive the high-order address bits
during EPROM programming and program verifica-
tion
RST Reset input A high on this pin for two machine
cycles while the oscillator is running resets the de-
vice An internal pulldown resistor permits a power-
on reset with only a capacitor connected to VCC
ALE Address Latch Enable output pulse for latching
the low byte of the address during accesses to ex-
ternal memory This pin (ALE PROG) is also the
program pulse input during EPROM programming for
the M87C51FC
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
4
PSEN Program Store Enable is the read strobe to
external Program Memory
When the M87C51FC is executing code from exter-
nal Program Memory PSEN is activated twice each
machine cycle except that two PSEN activations
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 a inverting amplifier which can be config-
ured for use as an on-chip oscillator as shown in
Figure 3 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 ’’
To drive the device from an external clock source
XTAL1 should be driven while XTAL2 floats as
shown in Figure 4 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 a
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 the VIL
and VIH specifications the capacitance will not ex-
ceed 20 pF
C1 C2 e 30 pF g10 pF for Crystals
e 10 pF for Ceramic Resonators
271114 – 4
Figure 3 Oscillator Connections

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M87C51FC 전자부품, 판매, 대치품
M87C51FC
DC CHARACTERISTICS (Over Specified Operating Conditions) (Continued)
Symbol
Parameter
Min
Max
Unit
VOH1
IIL
Output High Voltage
(Port 0 in External Bus Mode)
Logical 0 Input Current
(Ports 1 2 and 3)
VCCb0 3
VCCb0 7
VCCb1 5
b75
V
V
V
mA
ILI Input leakage Current (Port 0)
ITL Logical 1 to 0 Transition
Current (Ports 1 2 and 3)
g10
b750
mA
mA
RRST
RST Pulldown Resistor
40 225 KX
CIO Pin Capacitance
10 pF
ICC Power Supply Current
Running at 12 MHz (Figure 6)
Idle Mode at 12 MHz (Figure 7)
Power Down Mode (Figure 8)
Running at 16 MHz
Idle Mode at 16 MHz
Power Down Mode 16 MHz
40 mA
10 mA
100 mA
45 mA
15 mA
130 mA
Comments
IOH e b200 mA
IOH e b3 2 mA
IOH e b7 0 mA
VIN e 0 45V
0 k VIN k VCC
VIN e 2V
1 MHz 25 C
(Note 3)
NOTES
1 Capacitive loading on Ports 0 and 2 may cause spurious noise pulses to be superimposed on the VOLs of ALE and Ports
1 2 and 3 The noise is due to external bus capacitance discharging into the Port 0 and Port 2 pins when these pins make 1
to 0 transitions during bus operations In applications where capacitance loading exceeds 100 pFs the noise pulse on the
ALE signal may exceed 0 8V In these cases it may be desirable to qualify ALE with a Schmitt Trigger or use an Address
Latch with a Schmitt Trigger Strobe input
2 Capacitive loading on Ports 0 and 2 cause the VOH on ALE and PSEN to drop below the 0 9 VCC specification when the
address lines are stabilizing
3 See Figures 6 – 9 for load circuits Minimum VCC for Power Down is 2V
4 Under steady state (non-transient) conditions IOL must be externally limited as follows
Maximum IOL per port pin
10mA
Maximum IOL per 8-bit port
Port 0 26 mA
Ports 1 2 and 3 15 mA
Maximum total IOL for all output pins
71 mA
If IOL exceeds the test condition VOL may exceed the related specification Pins are not guaranteed to sink current greater
than the listed test conditions
ICC Max at other frequencies is given by
Active Mode
ICC Max e (Osc Freq c 3) a 4
Idle Mode
ICC Max e (Osc Freq c 0 5) a 4
Where Osc Freq is in MHz ICC is in mA
Figure 5 ICC vs Frequency
271114 – 6
271114 – 7
All other pins disconnected
TCLCH e TCHCL e 5 ns
Figure 6 ICC Load Circuits
Active Mode
7

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