Intel 80C51FA Manual de usuario

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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.

80C51FA/83C51FA

EVENT-CONTROL CHMOSSINGLE-CHIP

8-BIT MICROCONTROLLER

Automotive

YExtended Automotive

Temperature Range

(b40§Ctoa

125§C Ambient)

YHigh Performance CHMOS Process

YThree 16-Bit Timer/Counters

- Timer 2 is an Up/Down

Timer/Counter

YProgrammable Counter Array with:

- High Speed Output

- Compare/Capture

- Pulse Width Modulator

- Watchdog Timer Capabilities

Y8K On-Chip ROM

Y256 Bytes of On-Chip Data RAM

YBoolean Processor

Y32 Programmable I/O Lines

Y7 Interrupt Sources

YProgrammable Serial Channel with:

- Framing Error Detection

- Automatic Address Recognition

YTTL and CMOS Compatible Logic

Levels

Y64K External Program Memory Space

Y64K External Data Memory Space

YMCSÉ51 Microcontroller Fully

Compatible Instruction Set

YPower Saving Idle and Power Down

Modes

YONCE (On-Circuit Emulation) Mode

YAvailable in PLCC and PDIP Packages

(See Packaging Specification, Order Ý231369)

YAvailable in 12 MHz and 16 MHz

Versions

MEMORY ORGANIZATION

PROGRAM MEMORY: Up to 8 Kbytes of the program memory can reside in the on-chip ROM. 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 80C51FA/83C51FA is a single-chip control oriented microcontroller which is fabricated on Intel's

CHMOS III (83C51FA) ROM technology. For the remainder of this datasheet references to the ROMless

(80C51FA) and ROM (83C51FA) versions will be denoted as 83C51FA. Being a member of the MCSÉ51

microcontroller family, the 83C51FA uses the same powerful instruction set, has the same architecture, and is

pin-for-pin compatible with the existing MCS 51 microcontroller products. The 83C51FA is an enhanced

version of the 87C51. It's 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 brake and

traction control. It also has a more versatile serial channel that facilitates multi-processor communications.

NOTICE:

This datasheet contains information on products in full production. Specifications within this datasheet

are subject to change without notice. Verify with your local Intel sales office that you have the latest

datasheet before finalizing a design.

AUTOMOTIVE 80C51FA/83C51FA

270501±1

Figure 1. 83C51FA Block Diagram

AUTOMOTIVE 80C51FA/83C51FA

80C51FA/83C51FA 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

range of -40 °C to + 85°C

ambient. For the automo-

tive temperature range option, operational charac-

teristics are guaranteed over the temperature range

-40°C to +125°C

ambient.

As shown in Figure 2 temperature, burn-in, and

package options are identified by a one- or two-letter

prefix to the part number.

270501–2

Figure 2. MCS®51 Microcontroller Product Family Nomenclature

Table 1. Temperature Options

Temperature Temperature Operating Burn-In

Classification Designation Temperature Options

C Ambient

Extended T -40 to +85 Standard

L-40 to +85 Extended

Automotive A -40 to +125 Standard

B-40 to +125 Extended

x x

AUTOMOTIVE 80C51FA/83C51FA

PIN DESCRIPTIONS

VCC:Supply voltage.

VSS:Circuit ground.

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.

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 emitting1's, and can source and

sink several LS TTL inputs.

Port 0 outputs the code bytes during program verifi-

cation. 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

(IIL, on the datasheet) because of the internal pull-

ups.

In addition, Port 1 serves the functions of the follow-

ing special features of the 83C51FA:

Port Pin Alternate Function

P1.0 T2 (External Count Input to Timer/

Counter 2)

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 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 datasheet) 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. Dur-

ing accesses to external Data Memory that use 8-bit

Pin (PDIP)

270501±3

Pad (PLCC)

270501±4

**Do not connect reserved pins.

Diagrams are for pin reference only. Package sizes are not to scale.

Figure 3. Pin Connections

AUTOMOTIVE 80C51FA/83C51FA

addresses (MOVX @Ri), Port 2 emits the contents of

the P2 Special Function Register.

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 datasheet) because of the pullups.

Port 3 also serves the functions of various special

features of the MCS 51 microcontroller 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)

RESET:Reset input. A high on this pin for two ma-

chine cycles while the oscillator is running resets the

device. An internal pulldown resistor permits a pow-

er-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.

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, how-

ever, that one ALE pulse is skipped during each ac-

cess to external Data Memory.

Throughout the remainder of this datasheet, 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 83C51FA 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 Memo-

ry.

EA/V PP: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.

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, respec-

tively, of a 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.''

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 datasheet 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.

270501±5

C1, C2 e30 pF g10 pF for Crystals

For Ceramic Resonators, contact resonator manufacturer.

Figure 4. Oscillator Connections

AUTOMOTIVE 80C51FA/83C51FA

270501±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 if the Power Down mode is terminated with an

interrupt.

On the 83C51FA 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 allows 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 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

When the Idle mode is terminated by a hardware

reset, the device normally resumes program execu-

tion, 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.

ONCE MODE

The ONCE (``On-CircuitEmulation'') Mode facilitates

testing and debugging of systems using the

83C51FA without the 83C51FA having to be re-

moved 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, the other port pins and ALE and PSEN are

weakly pulled high. The oscillator circuit remains ac-

tive. While the 83C51FA 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.

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 Applications Handbook, and Applica-

tion Note AP-252, ``Designing with the 80C51BH.''

AUTOMOTIVE 80C51FA/83C51FA

ABSOLUTE MAXIMUM RATINGS*

Ambient Temperature

Under Bias...................................-40°C to +125°C

Storage Temperature.......................-65°C to +150°C

Voltage on Any Other Pin to VSS........-0.5V to +6.5V

IOL I/O Pin........................................................15mA

Power Dissipation

(Based on PACKAGE heat transfer limitations, not

device power consumption)

Typical Junction Temperature (TJ)................+135°C

(Based upon Ambient Temperature at a125§C)

Typical Thermal Resistance

Junction-to-Ambient (iJA)

PDIP.......................................................45°C/W

PLCC......................................................46°C/W

NOTICE: This is a production data sheet. The specifi-

cations 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 ex-

tended exposure beyond the ``Operating Conditions''

may affect device reliability.

DC CHARACTERISTICS: (TAeb

40§Ctoa

125§C; VCC e5V g10%; VSS e0V)

Symbol Parameter Min Typ Max Unit Test Conditions

VIL Input Low Voltage b0.5 0.2 VCCb0.1 V

VIL1 Input Low Voltage EA 0 0.2 VCCb0.3 V

VIH Input High Voltage 0.2 VCCa0.9 VCCa0.5 V

(Except XTAL2, RST, EA)

VIH1 Input High Voltage 0.7 VCC VCCa0.5 V

(XTAL, RST)

VOL Output Low Voltage 0.45 V IOL e1.6 mA(1)

(Ports 1, 2 and 3)

VOL1 Output Low Voltage 0.45 V IOL e20

(Port 0, ALE/PROG , PSEN)I

OL e3.2 mA(1)

IOL e7.0 mA

VOH Output High Voltage 2.4 V IOH eb

60 mA

(Ports 1, 2 and 3

ALE/PROG and PSEN) 0.9 VCC VI

OH eb

10 mA(2)

VOH1 Output High Voltage 2.4 V IOH eb

800 mA

(Port 0 in External Bus Mode) 0.9 VCC VI

OH eb

80 mA(2)

IIL Logical 0 Input Current b10 b50 mAV

IN e0.45V

(Ports 1, 2 and 3)

ILI Input leakage Current 0.02 g10 mAV

IN eVIL or VIH

(Port 0)

AUTOMOTIVE 80C51FA/83C51FA

DC CHARACTERISTICS:(TAeb

40§Ctoa

125§C; VCC e5V g10%; VSS e0V) (Continued)

Symbol Parameter Min Typ Max Unit Test Conditions

ITL Logical 1 to 0 Transition Current b265 b650 mAV

IN e2V

(Ports 1, 2, and 3)

RRST RST Pulldown Resistor 40 100 225 KX

CIO Pin Capacitance 10 pF @1MHz, 25§C

ICC Power Supply Current: (Note 3)

Running at 12 MHz (Figure 5) 40 mA

Idle Mode at 12 MHz (Figure 5) 15 mA

Power Down Mode (IPD) 150 mA

NOTES:

1. Capacitive loading on Ports 0 and 2 may cause noise pulses to be superimposed on the VOLs of ALE and Ports 1 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 test conditions. Minimum VCC for Power Down is 2.0V.

4. Typicals are based on limited number of samples, and are not guaranteed. The values listed are at room temperature and

5.0V.

5. Under steady state (non-transient) conditions, IOL must be externally limited as follows:

Maximum IOL per Port Pin: 10 mA

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.

6. Contact Intel for design-in information.

AUTOMOTIVE 80C51FA/83C51FA

270501±7

ICC Max at other frequencies is given by:

Active Mode

ICC Max e(3 cOsc Freq) a4

Idle Mode

ICC Max e(0.49 cOsc Freq) a1.6

Where Osc Freq is in MHz, ICC is in mA.

Figure 6. ICC vs Frequency

270501±8

TCLCH eTCHCL e5ns

Figure 7. ICC Test Condition, Active Mode

All other pins disconnected.

270501±9

TCLCH eTCHCL e5ns

Figure 8. ICC Test Condition Idle Mode.

All other pins disconnected.

270501±10

Figure 9. ICC Test Condition,

Power Down Mode.

All other pins disconnected.

VCC e2.0V to 5.5V.

270501±11

Figure 10. Clock Signal Waveform for ICC Tests in Active and Idle Modes. TCLCH eTCHCL e5 ns.

AUTOMOTIVE 80C51FA/83C51FA

EXPLANATION OF THE AC SYMBOLS

Each timing symbol has 5 characters. The first char-

acter 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,

TAVLL eTime from Address Valid to ALE Low

TLLPL eTime from ALE Low to PSEN Low

AC CHARACTERISTICS (TAeb

40§Ctoa

125§C, VCC e5V g10%, VSS e0V, Load Capacitance

for Port 0, ALE/PROG and PSEN e100 pF, Load Capacitance for All Other Outputs e80 pF)

EXTERNAL MEMORY CHARACTERISTICS

Symbol Parameter 12 MHz Oscillator Variable Oscillator Units

Min Max Min Max

1/T CLCL Oscillator Frequency 3.5 16 MHz

TLHLL ALE Pulse Width 127 2TCLCLb40 ns

TAVLL Address Valid to ALE Low 43 TCLCLb40 ns

TLLAX Address Hold After ALE Low 53 TCLCLb30 ns

TLLIV ALE Low to Valid Instruction In 224 4TCLCLb110 ns

TLLPL ALE Low to PSEN Low 53 TCLCLb30 ns

TPLPH PSEN Pulse Width 205 3TCLCLb45 ns

TPLIV PSEN Low to Valid Instruction In 135 3TCLCLb115 ns

TPXIX Input Instr Hold After PSEN Trans 0 0 ns

TPXIZ Input Instr Float After PSEN Trans 59 TCLCLb25 ns

TAVIV Address to Valid Instruction In 302 5TCLCLb115 ns

TPLAZ PSEN Low to Address Float 10 10 ns

TRLRH RD Pulse Width 400 6TCLCLb100 ns

TWLWH WR Pulse Width 400 6TCLCLb100 ns

TRLDV RD Low to Valid Data In 242 5TCLCLb175 ns

TRHDX Data Hold After RD High b10 b10 ns

TRHDZ Data Float After RD High 107 2TCLCLb60 ns

TLLDV ALE Low to Valid Data In 507 8TCLCLb160 ns

TAVDV Address Valid to Valid Data In 575 9TCLCLb175 ns

TLLWL ALE Low to RD or WR Low 200 300 3TCLCLb50 3TCLCLa50 ns

TAVWL Data Valid to WR Low 203 4TCLCLb130 ns

TQVWX Address Valid before WR Low 23 TCLCLb50 ns

TWHQX Data Hold after WR High 33 TCLCLb50 ns

TQVWH Data Valid to WE High 433 7TCLCLb150 ns

TRLAZ RD Low to Address Float 0 0 ns

TWHLH RD or WR High to ALE High 43 123 TCLCLb40 TCLCLa40 ns

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