CN1084497C - Method and circuit for data protection for microcomputer control system or intelligent card - Google Patents

Method and circuit for data protection for microcomputer control system or intelligent card Download PDF

Info

Publication number
CN1084497C
CN1084497C CN95114225A CN95114225A CN1084497C CN 1084497 C CN1084497 C CN 1084497C CN 95114225 A CN95114225 A CN 95114225A CN 95114225 A CN95114225 A CN 95114225A CN 1084497 C CN1084497 C CN 1084497C
Authority
CN
China
Prior art keywords
circuit
end
switch
smart card
resistance
Prior art date
Application number
CN95114225A
Other languages
Chinese (zh)
Other versions
CN1148208A (en
Inventor
黄志军
Original Assignee
黄志军
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 黄志军 filed Critical 黄志军
Priority to CN95114225A priority Critical patent/CN1084497C/en
Publication of CN1148208A publication Critical patent/CN1148208A/en
Application granted granted Critical
Publication of CN1084497C publication Critical patent/CN1084497C/en

Links

Abstract

The present invention relates to a method for protecting data in a microcomputer control system and an application apparatus thereof or a smart card. The protection method is that a power supply of an electric erasable memory or a smart card is not directly connected with a power supply of a microprocessor but is switched on and off by an external switch circuit, and power-on time is the time required by the operations of reading and writing. A protection circuit is composed of a switch, an integrated circuit, a triode, a capacitor, a resistor, etc., when a switch is actuated, the protection circuit supplies power to the erasable memory or the smart card. The protection circuit of the present invention has the characteristics that the external interference time is short, the failure rate is only 0.01% of that of a common product, the circuit is simple and practical, the application range is wide, etc.

Description

Data protection circuit in microcomputer control system or the smart card

The present invention relates to change in the equipment of a kind of microcomputer control system and application thereof or the smart card protection of not frequent significant data.

In the product facility of microcomputer control system and application thereof, often run into external world's (comprising what power supply and surrounding space sent) strong jamming, can dash the data of program (address) register of little processing (microcontroller) device in the microcomputer system disorderly, even former should address, place operation and jump to the operation of not right address suddenly, thereby read-write reservoir (RAM), the electricity that is rewritten as in the system that make the mistake can be wiped reservoir (E 2PROM) or the significant data in the smart card, make it make mistakes and break down.Up to the present, the way of this fault of solution that also do not find of people.

The purpose of this invention is to provide the data protection circuit in a kind of anti-strong jamming obvious results microcomputer control system or the smart card.

The present invention is by K switch or timing switch circuit independently, not circuit IC1, OR circuit IC2, monostable integrated circuit (IC) 3, triode T1, electric capacity (C1, C2, C3) and resistance (R1, R2, R3, R4) constitute, one end ground connection of K switch, the input end of other end NAND gate circuit IC1 and the input end of OR circuit IC2 interconnect, the output terminal of not circuit IC1 is connected with another input end of OR circuit IC2, the output terminal of OR circuit IC2 with interconnect with an end of resistance R 1 and the input end of monostable integrated circuit (IC) 3 again after capacitor C 1 is connected, be connected in series with resistance R 3 between the base stage of the output terminal of monostable integrated circuit (IC) 3 and triode T1, the emitter of triode T1 can be wiped reservoir (E with electricity independently 2PROM) or the power end V of smart card IC4 Cc, the positive pole of capacitor C 3 and an end of resistance R 4 interconnect, power supply V interconnects with the end of the collector of triode T1, resistance R 1, R2 respectively.

The invention will be further described below in conjunction with accompanying drawing:

Fig. 1 is a holding circuit schematic diagram of the present invention.

Referring to Fig. 1, IC1 is a not circuit among the figure, and IC2 is an OR circuit, and IC3 is monostable integrated circuit, and IC4 is a smart card, and IC5 is little processing (or microcontroller) device of microcomputer control system, E 2PROM can wipe reservoir for electricity independently.

Data guard method of the present invention is in the microcomputer control system that independently electricity can be wiped reservoir (E 2PROM) or the working power of smart card be to be subjected to external switch circuit or timing switch circuit control break-make independently, the electric signal that is produced when each on-off circuit is connected or opened circuit also makes OR circuit IC2 output terminal produce a high level by not circuit IC1, trigger pulse of monostable integrated circuit (IC) 3 outputs and cause triode T1 conducting, thereby can wipe reservoir (E to electricity independently 2PROM) or smart card working power is provided, power-on time can be wiped reservoir (E for electricity independently 2PROM) the required time of read-write operation is promptly between 30 milliseconds to 300 milliseconds.

K switch of the present invention can be hand switch, inductive switch or time switch independently, when K switch has connection (or opening circuit) action, by not circuit IC1 and OR circuit IC2, make the output terminal of OR circuit IC2 produce a high level, and trigger monostable integrated circuit (IC) 3 and export a pulse, make triode T1 conducting, and the emitter by triode T1 can be wiped reservoir (E to electricity independently 2PROM) or smart card IC4 power supply, power-on time (constant that discharges and recharges by resistance R 2, capacitor C 2 determines) is the recurrence interval of monostable integrated circuit (IC) 3 outputs, meanwhile, little processing (microcontroller) device IC5 of microcomputer control system when detecting K switch the variation of connecting or closing arranged, microprocessor IC5 promptly carry out necessary read-write independently electricity can wipe reservoir (E 2PROM) or the operation of data in the smart card IC4.

The present invention is applied in the control system or product facility of using microcomputer, then can obviously reduce the time that is subjected to external interference, and for example, this product facility switch every day (promptly connect or cut out) 288 times then stores the independently electricity of significant data and can wipe reservoir (E 2PROM) being subjected to the time ratio of external interference is 24 hours * 288/60ths * 60 * 30=10000/one, and the time ratio that can not be disturbed is 9999/10000ths, therefore, the failure rate that this product facility is occurred by external interference be ten thousand of common product equipment/, thereby improved the stability and the reliability 2 of product facility greatly

Characteristics of the present invention are: it is (namely anti-obviously reduced by the time of external interference Interference performance is strong), the fault that occurs because of external interference significantly descends, and fault rate is only Be ten thousand of general product facility/, thereby improved product facility (or microcomputer control System processed) stability and reliability; 2, holding circuit is simple, practical, cost Low, applied widely etc.

Claims (1)

1; data protection circuit in a kind of microcomputer control system or the smart card; it is characterized in that by switch (K) or timing switch circuit independently; not circuit (IC1); OR circuit (IC2); monostable integrated circuit (IC3); triode (T1); electric capacity (C1; C2; C3) and resistance (R1; R2; R3; R4) constitute; one end ground connection of switch (K); one input end of the input end of other end NAND gate circuit (IC1) and OR circuit (IC2) interconnects; the output terminal of not circuit (IC1) is connected with another input end of OR circuit (IC2); the output terminal of OR circuit (IC2) with interconnect with an end of resistance (R1) and the input end of monostable integrated circuit (IC3) again after electric capacity (C1) is connected; be connected in series with resistance (R3) between the base stage of the output terminal of monostable integrated circuit (IC3) and triode (T1), the emitter of triode (T1) can be wiped reservoir (E with electricity independently 2PROM) or the power end (V of smart card (IC4) Cc), the positive pole of electric capacity (C3) and an end of resistance (R4) interconnect, power supply (V) interconnects with the collector of triode (T1), an end of resistance (R1, R2) respectively.
CN95114225A 1995-10-18 1995-10-18 Method and circuit for data protection for microcomputer control system or intelligent card CN1084497C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN95114225A CN1084497C (en) 1995-10-18 1995-10-18 Method and circuit for data protection for microcomputer control system or intelligent card

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN95114225A CN1084497C (en) 1995-10-18 1995-10-18 Method and circuit for data protection for microcomputer control system or intelligent card

Publications (2)

Publication Number Publication Date
CN1148208A CN1148208A (en) 1997-04-23
CN1084497C true CN1084497C (en) 2002-05-08

Family

ID=5080262

Family Applications (1)

Application Number Title Priority Date Filing Date
CN95114225A CN1084497C (en) 1995-10-18 1995-10-18 Method and circuit for data protection for microcomputer control system or intelligent card

Country Status (1)

Country Link
CN (1) CN1084497C (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0283186A2 (en) * 1987-03-06 1988-09-21 Kabushiki Kaisha Toshiba Semiconductor integrated circuit with a plurality of circuit blocks having equivalent functions
EP0599244A2 (en) * 1992-11-27 1994-06-01 Nippondenso Co., Ltd. Portable electronic device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0283186A2 (en) * 1987-03-06 1988-09-21 Kabushiki Kaisha Toshiba Semiconductor integrated circuit with a plurality of circuit blocks having equivalent functions
EP0599244A2 (en) * 1992-11-27 1994-06-01 Nippondenso Co., Ltd. Portable electronic device

Also Published As

Publication number Publication date
CN1148208A (en) 1997-04-23

Similar Documents

Publication Publication Date Title
TWI262448B (en) Deep sleep in a RFID tag
US5537584A (en) Power instability control of a memory card and a data processing device therefor
US5717428A (en) Portable computer keyboard for use with a plurality of different host computers
CN1224179C (en) Portable electronic device with power source failture restoring function and failture restoring method
US4503291A (en) Repertory dialer with efficient data storage
EP0902436A3 (en) Microcomputer with flash memory programmable via external terminal
WO2004044755A3 (en) Universal non-volatile memory card used with various different standard cards containing a memory controller
CN100492407C (en) Integral circuit device with multiple communication model and its operation method
US20020161938A1 (en) Increasing control information from a single general purpose input/output (GPIO) mechanism
JPH03290711A (en) Electronic controller for vehicle
JPH04315281A (en) Hot plug circuit
EP1495916A2 (en) Device for awakening a control circuit
CN1090108A (en) IC card reader
EP1327958A4 (en) Noncontact communication medium and noncontact communication system
EP2256669A3 (en) Memory cards including a standard security function
CN102981425A (en) Startup and shutdown circuit
CN201513371U (en) Circuit with human touch stall protection function of electric fan
CA2127006A1 (en) Hot pluggable motherboard bus connector method
JPH1175320A (en) Overvoltage protective circuit
CN1088874C (en) A peripheral card having independent functionality and method used therewith
CN100337242C (en) Appliance with an IC card reader and overload protection circuit
WO2000039715A3 (en) Method of statistical analysis in an intelligent electronic device
CN1050458C (en) Overcurrent protection device
CN104777891A (en) OTG (on-the-go) connecting control method applied to intelligent terminal and connecting control device
CN102638094B (en) Self-assembling and self-healing power distribution equipment and safe switching method thereof

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
GR01 Patent grant
C14 Grant of patent or utility model
CF01 Termination of patent right due to non-payment of annual fee
C19 Lapse of patent right due to non-payment of the annual fee