*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.
April 1996COPYRIGHT©INTEL CORPORATION, 1996 Order Number: 272322-004
8XC51FX
CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLERS
Commercial/Express
87C51FA/83C51FA/80C51FA/87C51FB/83C51FB/87C51FC/83C51FC
*See Table 1 for Proliferation Options
Y
High Performance CHMOS
EPROM/ROM/CPU
Y
12/24/33 MHz Operation
Y
Three 16-Bit Timer/Counters
Y
Programmable Counter Array with:
Ð High Speed Output,
Ð Compare/Capture,
Ð Pulse Width Modulator,
Ð Watchdog Timer Capabilities
Y
Up/Down Timer/Counter
Y
Three Level Program Lock System
Y
8K/16K/32K On-Chip Program Memory
Y
256 Bytes of On-Chip Data RAM
Y
Improved 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:
Ð Framing Error Detection
Ð Automatic Address Recognition
Y
TTL Compatible Logic Levels
Y
64K External Program Memory Space
Y
64K External Data Memory Space
Y
MCSÉ51 Controller Compatible
Instruction Set
Y
Power Saving Idle and Power Down
Modes
Y
ONCE (On-Circuit Emulation) Mode
Y
Extended Temperature Range Except
for 33 MHz Offering (
b
40§Ctoa85§C)
MEMORY ORGANIZATION
Device
ROM
Version
EPROM ROMLESS
Version
ROM/
Bytes
RAM
EPROM
Bytes
83C51FA 87C51FA 80C51FA 8K 256
83C51FB 87C51FB 80C51FA 16K 256
83C51FC 87C51FC 80C51FA 32K 256
These devices can address up to 64 Kbytes of external program/data memory.
The Intel 87C51FA/8XC51FB/8XC51FC is a single-chip control oriented microcontroller which is fabricated on
Intel’s reliable CHMOS III-E technology. The Intel 83C51FA/80C51FA is fabricated on CHMOS III technology.
Being a member of the MCS
É
51 controller family, the 8XC51FA/8XC51FB/8XC51FC uses the same powerful
instruction set, has the same architecture, and is pin-for-pin compatible with the existing MCS 51 controller
products. The 8XC51FA/8XC51FB/8XC51FC is an enhanced version of the 8XC52/8XC54/8XC58. 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.
For the remainder of this document, the 8XC51FA, 8XC51FB, 8XC51FC will be referred to as the 8XC51FX,
unless information applies to a specific device.
8XC51FX
Table 1. Proliferation Options
Standard
*1
-1 -2 -24 -33
80C51FA X X X X X
83C51FA X X X X X
87C51FA X X X X X
83C51FB X X X X X
87C51FB X X X X X
83C51FC X X X X X
87C51FC X X X X X
NOTES:
*1 3.5 MHz to 12 MHz; 5V
g
20%
-1 3.5 MHz to 16 MHz; 5V
g
20%
-2 0.5 MHz to 12 MHz; 5V
g
20%
-24 3.5 MHz to 24 MHz; 5V
g
20%
-33 3.5 MHz to 33 MHz; 5V
g
10%
272322–1
Figure 1. 8XC51FX Block Diagram
2
8XC51FX
PROCESS INFORMATION
The 87C51FA/8XC51FB/8XC51FC is manufactured
on P629.0, a CHMOS III-E process. Additional process and reliability information is available in Intel’s
Components Quality and Reliability Handbook,
Or-
der No. 210997.
PACKAGES
Part Prefix Package Type
8XC51FX P 40-Pin Plastic DIP
D 40-Pin CERDIP
N 44-Pin PLCC
S 44-Pin QFP
272322–2
DIP
272322–23
PLCC
272322–24
*Do not connect Reserved Pins.
QFP
Figure 2. Pin Connections
3
8XC51FX
PIN DESCRIPTIONS
VCC: Supply voltage.
V
SS
: Circuit ground.
V
SS1
: Secondary ground (not on DIP devices or any
83C51FA/80C51FA device). Provided to reduce
ground bounce and improve power supply by-passing.
NOTE:
This pin is not a substitution for the V
SS
pin. (Con-
nection not necessary for proper operation.)
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-impedance inputs.
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 internal 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 required 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
(I
IL
, on the data sheet) because of the internal pull-
ups.
In addition, Port 1 serves the functions of the following special features of the 8XC51FX:
Port Pin Alternate Function
P1.0 T2 (External Count Input to Timer/
Counter 2), Clock Out
P1.1 T2EX (Timer/Counter 2 Capture/
Reload Trigger and Direction Control)
P1.2 ECI (External Count Input to the PCA)
P1.3 CEX0 (External I/O for Compare/
Capture Module 0)
P1.4 CEX1 (External I/O for Compare/
Capture Module 1)
P1.5 CEX2 (External I/O for Compare/
Capture Module 2)
P1.6 CEX3 (External I/O for Compare/
Capture Module 3)
P1.7 CEX4 (External I/O for Compare/
Capture Module 4)
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
(I
IL
, on the data sheet) because of the internal pull-
ups.
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. During 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 verification.
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.
4
8XC51FX
Port 3 also serves the functions of various special
features of the MCS-51 Family, as listed below:
Port Pin Alternate Function
P3.0 RXD (serial input port)
P3.1 TXD (serial output port)
P3.2 INT0 (external interrupt 0)
P3.3 INT1
(external interrupt 1)
P3.4 T0 (Timer 0 external input)
P3.5 T1 (Timer 1 external input)
P3.6 WR
(external data memory write strobe)
P3.7 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 device. The port pins will be driven to their reset condition when a minimum V
IH1
voltage is applied whether the oscillator is running or not. An internal pulldown resistor permits a power-on reset with only a
capacitor connected to V
CC
.
ALE: 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 programming for
the 87C51FX.
In normal operation ALE is emitted at a constant
rate of (/6 the oscillator frequency, and may be used
for external timing or clocking purposes. Note, however, that one ALE pulse is skipped during each access to external Data Memory.
If desired, ALE operation can be disabled by setting
bit 0 of SFR location 8EH. With this bit set, the pin is
weakly pulled high. However, the ALE disable feature will be suspended during a MOVX or MOVC instruction, idle mode, power down mode and ICE
mode. The ALE disable feature will be terminated by
reset. When the ALE disable feature is suspended or
terminated, the ALE pin will no longer be pulled up
weakly. Setting the ALE-disable bit has no affect if
the microcontroller is in external execution mode.
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 8XC51FX is executing code from external
Program Memory, PSEN
is activated twice each ma-
chine 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 0FFFH. Note, however, that if either of the
Program Lock bits are programmed, EA will be internally latched on reset.
EA
should be strapped to VCCfor internal program
executions.
This pin also receives the programming supply voltage (V
PP
) during EPROM programming.
XTAL1: Input to the inverting oscillator amplifier.
XTAL2: Output from the inverting oscillator amplifi-
er.
OSCILLATOR CHARACTERISTICS
XTAL1 and XTAL2 are the input and output, respectively, of a inverting amplifier which can be configured 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 Application Note AP-155, ‘‘Oscillators for Microcontrollers.’’
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 input to the internal clocking circuitry is through a
divide-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 V
IL
and VIHspecifications the capacitance will not exceed 20 pF.
5
8XC51FX
272322–3
C1, C2
e
30 pFg10 pF for Crystals
For Ceramic Resonators, contact resonator manufacturer.
Figure 3. Oscillator Connections
272322–4
Figure 4. External Clock Drive Configuration
IDLE MODE
The user’s software can invoke the Idle Mode. When
the microcontroller is in this mode, power consumption 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 enabled 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 values until the Power Down mode is terminated.
On the 8XC51FX either hardware reset or external
interrupt can cause an exit from Power Down. Reset
redefines all the SFRs but does not change the onchip RAM. An external interrupt allows both the
SFRs and the on-chip RAM to retain their values.
To properly terminate Power Down the reset or external interrupt should not be executed before V
CC
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 enabled and configured as level-sensitive. Holding the
pin low restarts the oscillator but bringing the pin
back high completes 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.
DESIGN CONSIDERATION
#
Ambient light is known to affect the internal RAM
contents during operation. If the 87C51FX application requires the part to be run under ambient
lighting, an opaque label should be placed over
the window to exclude light.
#
When the idle mode is terminated by a hardware
reset, the device normally resumes program execution, from where it left off, up to two machine
cycles before the internal reset algorithm takes
control. On-chip hardware inhibits access to internal RAM in this event, but access to the port pins
is not inhibited. To eliminate the possibility of an
unexpected write when Idle is terminated by reset, the instruction following the one that invokes
Idle should not be one that writes to a port pin or
to external memory.
Table 2. Status of the External Pins during Idle and Power Down
Mode
Program
ALE PSEN PORT0 PORT1 PORT2 PORT3
Memory
Idle Internal 1 1 Data Data Data Data
Idle External 1 1 Float Data Address Data
Power Down Internal 0 0 Data Data Data Data
Power Down External 0 0 Float Data Data Data
NOTE:
For more detailed information on the reduced power modes refer to current Embedded Microcontrollers and Processors
Handbook Volume I, and Application Note AP-252 (Embedded Applications Handbook), ‘‘Designing with the 80C51BH.’’
6
8XC51FX
ONCE MODE
The ONCE (‘‘On-Circuit Emulation’’) Mode facilitates
testing and debugging of systems using the
8XC51FX without the 8XC51FX having to be removed from the circuit. The ONCE Mode is invoked
by:
1) Pull ALE low while the device is in reset and
PSEN
is high;
2) Hold ALE low as RST is deactivated.
While the device is in ONCE Mode, the Port 0 pins
float, and the other port pins and ALE and PSEN
are
weakly pulled high. The oscillator circuit remains active. While the 8XC51FX is in this mode, an emulator
or test CPU can be used to drive the circuit. Normal
operation is restored when a normal reset is applied.
8XC51FX EXPRESS
The Intel EXPRESS system offers enhancements to
the operational specifications of the MCS-51 family
of microcontrollers. These EXPRESS products are
designed to meet the needs of those applications
whose operating requirements exceed commercial
standards.
The EXPRESS program includes the commercial
standard temperature range with burn-in and an extended temperature range with or without burn-in.
With the commercial standard temperature range,
operational characteristics are guaranteed over the
temperature range of 0
§
Cto70§C. With the extended temperature range option, operational characteristics are guaranteed over the range of
b
40§Cto
a
85§C.
The optional burn-in is dynamic for a minimum time
of 168 hours at 125
§
C with V
CC
e
6.9Vg0.25V,
following guidelines in MlL-STD-883, Method 1015.
Package types and EXPRESS versions are identified
by a one- or two-letter prefix to the part number. The
prefixes are listed in Table 3.
For the extended temperature range option, this
data sheet specifies the parameters which deviate
from their commercial temperature range limits.
NOTE:
Intel offers Express Temperature specifications for all 8XC51FX speed options except
for 33 MHz.
Table 3. Prefix Identification
Prefix Package Type Temperature Range Burn-In
D Cerdip Commercial No
N PLCC Commercial No
P Plastic Commercial No
S QFP Commercial No
LD Cerdip Extended Yes
LN PLCC Extended Yes
LP Plastic Extended Yes
LS QFP Extended Yes
TD Cerdip Extended No
TN PLCC Extended No
TP Plastic Extended No
TS QFP Extended No
NOTE:
Contact distributor or local sales office to match EXPRESS prefix with proper device.
EXAMPLES:
P87C51FC indicates 87C51FC in a plastic package and specified for commercial temperature range, without burn-in.
LD87C51FC indicates 87C51FC in a cerdip package and specified for extended temperature range with burn-in.
7
8XC51FX
ABSOLUTE MAXIMUM RATINGS*
Ambient Temperature Under Bias Àb40§Ctoa85§C
Storage Temperature ААААААААААb65§Ctoa150§C
Voltage on EA/VPPPin to VSSААААААА0V toa13.0V
Voltage on Any Other Pin to VSSÀÀb0.5V toa6.5V
IOLper I/O Pin ААААААААААААААААААААААААААА15 mA
Power DissipationАААААААААААААААААААААААААА1.5W
(based on PACKAGE heat transfer limitations, not
device power consumption)
NOTICE: This data sheet contains preliminary information on new products in production. It is valid for
the devices indicated in the revision history. The
specifications are subject to change without notice.
*
WARNING: Stressing the device beyond the ‘‘Absolute
Maximum Ratings’’ may cause permanent damage.
These are stress ratings only. Operation beyond the
‘‘Operating Conditions’’ is not recommended and extended exposure beyond the ‘‘Operating Conditions’’
may affect device reliability.
OPERATING CONDITIONS
Symbol Description Min Max Units
T
A
Ambient Temperature Under Bias
Commercial 0
a
70
§
C
Express
b
40
a
85
V
CC
Supply Voltage
8XC51FX-33 4.5 5.5
V
All Others 4.0 6.0
f
OSC
Oscillator Frequency
8XC51FX 3.5 12
8XC51FX-1 3.5 16
MHz
8XC51FX-2 0.5 12
8XC51FX-24 3.5 24
8XC51FX-33 3.5 33
DC CHARACTERISTICS (Over Operating Conditions)
All parameter values apply to all devices unless otherwise indicated.
Symbol Parameter Min
Typical
Max Units Test Conditions
(Note 4)
V
IL
Input Low Voltage
b
0.5 0.2 V
CC
b
0.1 V
V
IL1
Input Low Voltage EA 0 0.2 V
CC
b
0.3 V
V
IH
Input High Voltage 0.2 V
CC
a
0.9 V
CC
a
0.5 V
(Except XTAL1, RST)
V
IH1
Input High Voltage 0.7 V
CC
V
CC
a
0.5 V
(XTAL1, RST)
V
OL
Output Low Voltage (Note 5) 0.3 I
OL
e
100 mA
(Ports 1, 2 and 3) 0.45 V I
OL
e
1.6 mA (Note 1)
1.0 I
OL
e
3.5 mA
V
OL1
Output Low Voltage (Note 5) 0.3 I
OL
e
200 mA
(Port 0, ALE/PROG, PSEN) 0.45 V I
OL
e
3.2 mA (Note 1)
1.0 I
OL
e
7.0 mA
V
OH
Output High Voltage V
CC
b
0.3 I
OH
eb
10 mA
(Ports 1, 2 and 3 V
CC
b
0.7 V I
OH
eb
30 mA (Note 2)
ALE/PROG
and PSEN)V
CC
b
1.5 I
OH
eb
60 mA
V
OH1
Output High Voltage V
CC
b
0.3 I
OH
eb
200 mA
(Port 0 in External Bus Mode) V
CC
b
0.7 V I
OH
eb
3.2 mA (Note 2)
V
CC
b
1.5 I
OH
eb
7.0 mA
83C51FA/80C51FA (Express) I
OH
eb
6.0 mA
I
IL
Logical 0 Input Current
b
50 mAV
IN
e
0.45V
(Ports 1, 2 and 3)
8
8XC51FX
DC CHARACTERISTICS (Over Operating Conditions)
All parameter values apply to all devices unless otherwise indicated. (Continued)
Symbol Parameter Min
Typical
Max Units Test Conditions
(Note 4)
I
LI
Input leakage Current (Port 0)
g
10 mAV
IN
e
VILor V
IH
I
TL
Logical 1 to 0 Transition Current V
IN
e
2V
(Ports 1, 2 and 3)
Express
b
750
mA
Commercial
b
650
RRST RST Pulldown Resistor 40 225 KX
CIO Pin Capacitance 10 pF
@
1MHz, 25§C
I
CC
Power Supply Current: (Note 3)
Active Mode
At 12 MHz (Figure 5) 15 30 mA
At 16 MHz 20 38 mA
At 24 MHz 28 56 mA
At 33 MHz 35 56 mA
Idle Mode
At 12 MHz (Figure 5) 5 7.5 mA
At 16 MHz 6 9.5 mA
At 24 MHz 7 13.5 mA
At 33 MHz 7 15 mA
Power Down Mode 5 75 mA
NOTES:
1. Capacitive loading on Ports 0 and 2 may cause noise pulses above 0.4V to be superimposed on the V
OL
s 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
change from 1 to 0. In applications where capacitance loading exceeds 100 pF, the noise pulses on these signals may
exceed 0.8V. It may be desirable to qualify ALE or other signals with a Schmitt Trigger, or CMOS-level input logic.
2. Capacitive loading on Ports 0 and 2 cause the V
OH
on ALE and PSEN to drop below the 0.9 VCCspecification when the
address lines are stabilizing.
3. See Figures 6 – 9 for test conditions. Minimum V
CC
for power down is 2V.
4. Typicals are based on limited number of samples, and are not guaranteed. The values listed are at room temperature and 5V.
5. Under steady state (non-transient) conditions, I
OL
must be externally limited as follows:
Maximum I
OL
per port pin: 10 mA
Maximum I
OL
per 8-bit port -
Port 0: 26 mA
Ports 1, 2, and 3: 15 mA
Maximum total I
OL
for all output pins: 71 mA
If I
OL
exceeds the test condition, VOLmay exceed the related specification. Pins are not guaranteed to sink current greater
than the listed test conditions.
272322–5
Note:
I
CC
max at 33 MHz is at 5Vg10% VCC, while ICCmax at 24 MHz and below is at 5Vg20% VCC.
Figure 5. 8XC51FA/FB/FC ICCvs Frequency
9
8XC51FX
272322–6
All other pins disconnected
TCLCH
e
TCHCLe5ns
Figure 6. ICCTest Condition, Active Mode
272322–7
All other pins disconnected
TCLCH
e
TCHCLe5ns
Figure 7. ICCTest Condition Idle Mode
272322–8
All other pins disconnected
Figure 8. ICCTest Condition, Power Down Mode.
V
CC
e
2.0V to 6.0V.
272322–19
Figure 9. Clock Signal Waveform for ICCTests in Active and Idle Modes. TCLCHeTCHCLe5 ns.
10
8XC51FX
EXPLANATION OF THE AC SYMBOLS
Each timing symbol has 5 characters. The first character is always a ‘T’ (stands for time). The other
characters, depending on their positions, stand for
the name of a signal or the logical status of that
signal. The following is a list of all the characters and
what they stand for.
A: Address
C: Clock
D: Input Data
H: Logic level HIGH
I: Instruction (program memory contents)
L: Logic level LOW, or ALE
P: PSEN
Q: Output Data
R: RD signal
T: Time
V: Valid
W: WR
signal
X: No longer a valid logic level
Z: Float
For example,
TAVLLeTime from Address Valid to ALE Low
TLLPLeTime from ALE Low to PSEN Low
AC CHARACTERISTICS (Over Operating Conditions, Load Capacitance for Port 0, ALE/PROG and
PSEN
e
100 pF, Load Capacitance for All Other Outputse80 pF)
EXTERNAL MEMORY CHARACTERISTICS
All parameter values apply to all devices unless otherwise indicated. In this table, 8XC51FX refers to
8XC51FX, 8XC51FX-1 and 8XC51FX-2.
Symbol Parameter
Oscillator
Units
12 MHz 24 MHz 33 MHz Variable
Min Max Min Max Min Max Min Max
1/TCLCL Oscillator Frequency
MHz
8XC51FX 3.5 12
8XC51FX-1 3.5 16
8XC51FX-2 0.5 12
8XC51FX-24 3.5 24
8XC51FX-33 3.5 33
TLHLL ALE Pulse Width 127 43 21 2TCLCLb40 ns
TAVLL Address Valid to ALE Low
8XC51FX 43 TCLCL
b
40 ns
8XC51FX-24 12 TCLCL
b
30 ns
8XC51FX-33 5 TCLCLb25 ns
TLLAX Address Hold After ALE Low
8XC51FX/-24 53 12 TCLCL
b
30 ns
8XC51FX-33 5 TCLCLb25 ns
TLLIV ALE Low to Valid Instr In
8XC51FX 234 4TCLCL
b
100 ns
8XC51FX-24 91 4TCLCL
b
75 ns
8XC51FX-33 56 4TCLCLb65 ns
TLLPL ALE Low to PSEN Low
8XC51FX/-24 53 12 TCLCL
b
30 ns
8XC51FX-33 5 TCLCLb25 ns
TPLPH PSEN Pulse Width 205 80 46 3TCLCLb45
TPLIV PSEN Low to Valid Instr In
8XC51FX 145 3TCLCL
b
105 ns
8XC51FX-24 35 3TCLCLb90 ns
8XC51FX-33 35 3TCLCLb55 ns
TPXIX Input Instr Hold after PSEN 000 0 ns
11
8XC51FX
EXTERNAL MEMORY CHARACTERISTICS (Continued)
All parameter values apply to all devices unless otherwise indicated
Symbol Parameter
Oscillator
Units
12 MHz 24 MHz 33 MHz Variable
Min Max Min Max Min Max Min Max
TPXIZ Input Instr Float After PSEN
8XC51FX 59 TCLCL-25 ns
8XC51FX-24 21 TCLCL-20 ns
8XC51FX-33 5 TCLCL-25 ns
TAVIV Address to Valid Instr In
8XC51FX/-24 312 103 5TCLCL
b
105 ns
8XC51FX-33 71 5TCLCLb80 ns
TPLAZ PSEN Low to Address Float 10 10 10 10 ns
TRLRH RD Pulse Width 400 150 82 6TCLCLb100 ns
TWLWH WR Pulse Width 400 150 82 6TCLCLb100 ns
TRLDV RD Low to Valid Data In
8XC51FX 252 5TCLCL
b
165 ns
8XC51FX-24 113 5TCLCLb95 ns
8XC51FX-33 61 5TCLCL
b
90 ns
TRHDX Data Hold After RD 000 0 ns
TRHDZ Data Float After RD
8XC51FX/24 107 23 2TCLCLb60 ns
8XC51FX-33 35 2TCLCLb25 ns
TLLDV ALE Low to Valid Data In
8XC51FX 517 8TCLCL
b
150 ns
8XC51FX-24/33 243 150 8TCLCL
b
90 ns
TAVDV Address to Valid Data In
8XC51FX 585 9TCLCL
b
165 ns
8XC51FX-24/33 285 180 9TCLCLb90 ns
TLLWL ALE Low to RD or WR Low 200 300 75 175 41 140 3TCLCLb50 3TCLCLa50 ns
TAVWL Address to RD or WR Low
8XC51FX 203 4TCLCL
b
130 ns
8XC51FX-24 77 4TCLCL
b
90 ns
8XC51FX-33 46 4TCLCL
b
75 ns
TQVWX Data Valid to WR Transition
8XC51FX 33 TCLCLb50 ns
8XC51FX-24/33 12 0 TCLCLb30 ns
TWHQX Data Hold After WR
8XC51FX 33 TCLCLb50 ns
8XC51FX-24 7 TCLCL
b
35 ns
8XC51FX-33 3 TCLCL
b
27 ns
TQVWH Data Valid to WR High
8XC51FX 433 7TCLCLb150 ns
8XC51FX-24/33 222 142 7TCLCLb70 ns
TRLAZ RD Low to Address Float 0 0 0 0 ns
TWHLH RD or WR High to ALE High
8XC51FX 43 123 TCLCL
b
40 TCLCLa40 ns
8XC51FX-24 12 71 TCLCL
b
30 TCLCLa30 ns
8XC51FX-33 5 55 TCLCL
b
25 TCLCLa25 ns
12
8XC51FX
EXTERNAL PROGRAM MEMORY READ CYCLE
272322–9
EXTERNAL DATA MEMORY READ CYCLE
272322–10
EXTERNAL DATA MEMORY WRITE CYCLE
272322–11
13
8XC51FX
SERIAL PORT TIMINGÐSHIFT REGISTER MODE
Test Conditions:
Over Operating Conditions; Load Capacitancee80 pF
Symbol Parameter
Oscillator
Units
12 MHz 24 MHz 33 MHz Variable
Min Max Min Max Min Max Min Max
TXLXL Serial Port 1 0.50 0.36 12TCLCL ms
Clock
Cycle Time
TQVXH Output Data 700 284 167 10TCLCLb133 ns
Setup to Clock
Rising Edge
TXHQX Output Data
Hold After Clock
Rising Edge
8XC51FX 50 2TCLCL
b
117 ns
8XC51FX-24/33 34 10 2TCLCLb50 ns
TXHDX Input Data Hold 0 0 0 0 ns
After Clock
Rising Edge
TXHDV Clock Rising 700 283 167 10TCLCLb133 ns
Edge to Input
Data Valid
SHIFT REGISTER MODE TIMING WAVEFORMS
272322–12
14
8XC51FX
EXTERNAL CLOCK DRIVE
Symbol Parameter Min Max Units
1/TCLCL Oscillator Frequency MHz
8XC51FX 3.5 12 MHz
8XC51FX-1 3.5 16 MHz
8XC51FX-2 0.5 12 MHz
8XC51FX-24 3.5 24 MHz
8XC51FX-33 3.5 33 MHz
TCHCX High Time 20 ns
8XC51FX-24/33 0.35 T
OSC
0.65 T
OSC
ns
TCLCX Low Time 20 ns
8XC51FX-24/33 0.35 T
OSC
0.65 T
OSC
ns
TCLCH Rise Time 20 ns
8XC51FX-24 10 ns
8XC51FX-33 5 ns
TCHCL Fall Time 20 ns
8XC51FX-24 10 ns
8XC51FX-33 5 ns
EXTERNAL CLOCK DRIVE WAVEFORM
272322–13
AC TESTING INPUT, OUTPUT WAVEFORMS
272322–14
AC Inputs during testing are driven at V
CC
b
0.5V for a Logic ‘‘1’’
and 0.45V for a Logic ‘‘0’’. Timing measurements are made at V
IH
min for a Logic ‘‘1’’ and VOLmax for a Logic ‘‘0’’.
FLOAT WAVEFORMS
272322–15
For timing purposes a port pin is no longer floating when a
100 mV change from load voltage occurs, and begins to float
when a 100 mV change from the loaded V
OH/VOL
level occurs.
I
OL/IOH
e
g
20 mA.
15
8XC51FX
PROGRAMMING THE EPROM/OTP
To be programmed, the part must be running with a
4 to 6 MHz oscillator. (The reason the oscillator
needs to be running is that the internal bus is being
used to transfer address and program data to appropriate internal EPROM locations.) The address of an
EPROM location to be programmed is applied to
Port 1 and pins P2.0 - P2.4 of Port 2, while the code
byte to be programmed into that location is applied
to Port 0. The other Port 2 and 3 pins, RST PSEN
,
and EA
/VPPshould be held at the ‘‘Program’’ levels
indicated in Table 4. ALE/PROG
is pulsed low to
program the code byte into the addressed EPROM
location. The setup is shown in Figure 10.
Normally EA
/VPPis held at logic high until just be-
fore ALE/PROG
is to be pulsed. Then EA/VPPis
raised to V
PP
, ALE/PROG is pulsed low, and then
EA
/VPPis returned to a valid high voltage. The volt-
age on the EA
/VPPpin must be at the valid EA/V
PP
high level before a verify is attempted. Waveforms
and detailed timing specifications are shown in later
sections of this data sheet.
NOTE:
#
EA/VPPpin must not be allowed to go above the
maximum specified V
PP
level for any amount of
time. Even a narrow glitch above that voltage level can cause permanent damage to the device.
The V
PP
source should be well regulated and free
of glitches.
Table 4. EPROM Programming Modes
Mode RST PSEN
ALE/ EA/
P2.6 P2.7 P3.3 P3.6 P3.7
PROG
V
PP
Program Code Data H L ß 12.75V L H H H H
Verify Code Data H L H H L L L H H
Program Encryption H L ß 12.75V L H H L H
Array Address 0 –3FH
Program Lock Bit 1 H L ß 12.75V H H H H H
Bits
Bit 2 H L ß 12.75V H H H L L
Bit 3 H L ß 12.75V H L H H L
Read Signature Byte H L H H L L L L L
272322–20
*See Table 4 for proper input on these pins
Figure 10. Programming the EPROM
16
8XC51FX
PROGRAMMING ALGORITHM
Refer to Table 4 and Figures 10 and 11 for address,
data, and control signals set up. To program the
87C51FX the following sequence must be exercised.
1. Input the valid address on the address lines.
2. Input the appropriate data byte on the data
lines.
3. Activate the correct combination of control signals.
4. Raise EA
/VPPfrom VCCto 12.75Vg0.25V.
5. Pulse, ALE/PROG
5 times for the EPROM array, and 25 times for the encryption table and
the lock bits.
Repeat 1 through 5 changing the address and data
for the entire array or until the end of the object file is
reached.
PROGRAM VERIFY
Program verify may be done after each byte or block
of bytes is programmed. In either case a complete
verify of the programmed array will ensure reliable
programming of the 87C51FX.
The lock bits cannot be directly verified. Verification
of the lock bits is done by observing that their features are enabled.
272322–21
Figure 11. Programming Signals Waveforms
ROM and EPROM Lock System
The 87C51FX program lock system, when programmed, protects the onboard program against
software piracy.
The 83C51FX has a one-level program lock system
and a 64-byte encryption table. See line 2 of Table
5. If program protection is desired, the user submits
the encryption table with their code, and both the
lock-bit and encryption array are programmed by the
factory. The encryption array is not available without
the lock bit. For the lock bit to be programmed, the
user must submit an encryption table. The 83C51FA
does not have protection features.
The 87C51FX has a 3-level program lock system
and a 64-byte encryption array. Since this is an
EPROM device, all locations are user-programmable. See Table 5.
Table 5. Program Lock Bits and the Features
Program Lock Bits
ProtectIon Type
LB1 LB2 LB3
1 U U U No Program Lock features enabled. (Code verify will still be encrypted by the
Encryption Array if programmed.)
2 P U U MOVC instructions executed from external program memory are disabled from
fetching code bytes from internal memory, EA is sampled and latched on Reset, and
further programming of the EPROM is disabled.
3 P P U Same as 2, also verify is disabled.
4 P P P Same as 3, also external execution is disabled.
Any other combination of the lock bits is not defined.
17
8XC51FX
Encryption Array
Within the EPROM array are 64 bytes of Encryption
Array that are initially unprogrammed (all 1’s). Every
time that a byte is addressed during a verify, 6 address lines are used to select a byte of the Encryption Array. This byte is then exclusive-NOR’ed
(XNOR) with the code byte, creating an Encryption
Verify byte. The algorithm, with the array in the unprogrammed state (all 1’s), will return the code in its
original, unmodified form. For programming the Encryption Array, refer to Table 4 (Programming the
EPROM).
When using the encryption array, one important factor needs to be considered. If a code byte has the
value 0FFH, verifying the byte will produce the encryption byte value. lf a large block (
l
64 bytes) of
code is left unprogrammed, a verification routine will
display the contents of the encryption array. For this
reason all unused code bytes should be programmed with some value other than 0FFH, and not
all of them the same value. This will ensure maximum program protection.
Program Lock Bits
The 87C51FX has 3 programmable lock bits that
when programmed according to Table 5 will provide
different levels of protection for the on-chip code
and data.
Erasing the EPROM also erases the encryption array and the program lock bits, returning the part to
full functionality.
Reading the Signature Bytes
The 87C51FX has 3 signature bytes in locations
30H, 31H, and 60H. The 83C51FA has 2 signature
bytes in locations 30H and 31H. To read these bytes
follow the procedure for EPROM verify, but activate
the control lines provided in Table 4 for Read Signature Byte.
Location Device Contents
30H All 89H
31H All 58H
60H 83C51FA 7AH/FAH
87C51FA FAH
83C51FB 7BH/FBH
87C51FB FBH
83C51FC 7CH/FCH
87C51FC FCH
Erasure Characteristics (Windowed
Packages Only)
Erasure of the EPROM begins to occur when the
chip is exposed to light with wavelength shorter than
approximately 4,000 Angstroms. Since sunlight and
fluorescent lighting have wavelengths in this range,
exposure to these light sources over an extended
time (about 1 week in sunlight, or 3 years in roomlevel fluorescent lighting) could cause inadvertent
erasure. If an application subjects the device to this
type of exposure, it is suggested that an opaque label be placed over the window.
The recommended erasure procedure is exposure
to ultraviolet light (at 2537 Angstroms) to an integrated dose of at least 15 W-sec/cm. Exposing the
EPROM to an ultraviolet lamp of 12,000 mW/cm rating for 30 minutes, at a distance of about 1 inch,
should be sufficient.
Erasure leaves all the EPROM Cells in a 1’s state.
18
8XC51FX
EPROM PROGRAMMING AND VERIFICATION CHARACTERISTICS
(T
A
e
21§Cto27§C; V
CC
e
5Vg20%; V
SS
e
0V)
Symbol Parameter Min Max Units
V
PP
Programming Supply Voltage 12.5 13.0 V
I
PP
Programming Supply Current 75 mA
1/TCLCL Oscillator Frequency 4 6 MHz
TAVGL Address Setup to PROG Low 48TCLCL
TGHAX Address Hold after PROG 48TCLCL
TDVGL Data Setup to PROG Low 48TCLCL
TGHDX Data Hold after PROG 48TCLCL
TEHSH P2.7 (ENABLE) High to V
PP
48TCLCL
TSHGL VPPSetup to PROG Low 10 ms
TGHSL VPPHold after PROG 10 ms
TGLGH PROG Width 90 110 ms
TAVQV Address to Data Valid 48TCLCL
TELQV ENABLE Low to Data Valid 48TCLCL
TEHQZ Data Float after ENABLE 0 48TCLCL
TGHGL PROG High to PROG Low 10 ms
EPROM PROGRAMMING AND VERIFICATION WAVEFORMS
272322–18
NOTE:
*5 pulses for the EPROM array, 25 pulses for the encryption table and lock bits.
19
8XC51FX
Thermal Impedance
All thermal impedance data is approximate for static
air conditions at 1W of power dissipation. Values will
change depending on operating conditions and applications. See the Intel Packaging Handbook (Order
No. 240800) for a description of Intel’s thermal impedance test methodology.
Package i
JA
i
JC
Device
P45
§
C/W 16§C/W All
D36
§
C/W 13§C/W 80C51FA, 83C51FA,
8XC51FC
45§C/W 15§C/W 87C51FA, 8XC51FB
N46
§
C/W 16§C/W All
S97
§
C/W 24§C/W FA
96
§
C/W 24§C/W FB
87
§
C/W 18§C/W FC
DATA SHEET REVISION HISTORY
Data sheets are changed as new device information becomes available. Verify with your local Intel sales office
that you have the latest version before finalizing a design or ordering devices.
The following differences exist between this datasheet (272322-003) and the previous version (272322-002):
1. Removed 8XC51FX-3 and 8XC51FX-20, replaced with 8XC51FX-24.
2. Included 8XC51FX-24 and 8XC51FX-33 devices.
3. 80C51FA and 83C51FA now have the same features as 87C51FA, 8XC51FB and 8XC51FC; same DC spec
used for all devices.
The following differences exist between the ‘‘-002’’ and ‘‘-001’’ version of 8XC51FX datasheet:
1. Removed 8XC51FX-L from datasheet.
2. Include V
OH1
for 83C51FA (Express)/80C51FA (Express).
This 8XC51FX datasheet (272322-001) replaces the following datasheets:
87C51FA/83C51FA/80C51FA 270258-007
83C51FA/80C51FA EXPRESS 270620-001
87C51FA EXPRESS 270619-001
87C51FA-20/-3 272081-002
87C51FB/83C51FB 270563-005
87C51FB-20/-3 83C51FB-20/-3 272080-002
87C51FB/83C51FB EXPRESS 270767-002
87C51FC/83C51FC 270789-004
87C51FC/83C51FC EXPRESS 270903-001
87C51FC-20/-3 83C51FC-20/-3 272028-002
20
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