WO1989009957A1 - Microcomputer with reset signal distinguishing means - Google Patents
Microcomputer with reset signal distinguishing means Download PDFInfo
- Publication number
- WO1989009957A1 WO1989009957A1 PCT/EP1988/000314 EP8800314W WO8909957A1 WO 1989009957 A1 WO1989009957 A1 WO 1989009957A1 EP 8800314 W EP8800314 W EP 8800314W WO 8909957 A1 WO8909957 A1 WO 8909957A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- reset signal
- microcomputer
- processor
- reset
- signal
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/24—Resetting means
Definitions
- the present invention relates to a microcom ⁇ puter having a processor of a type operating with a reset signal and a RAM whose contents are changed periodically from an initial condition. It is known to control one or more functions in a vehicle using an electronic control unit incorpo ⁇ rating a microcomputer. In many applications, the microcomputer has an associated RAM whose contents are changed periodically. One example of this is an elec- tronically controlled ignition system. Further, the control unit usually is arranged to reset the contents of the RAM to a set of initial data on initial switch on of power to the -unit.
- the microcomputer operates with a reset signal but this does not refresh the RAM with the set of initial data. It is therefore necessary to distinguish between a reset signal which requires refreshing of the RAM with the set of initial data and a further reset signal which does not require this.
- the microcomputer uses a single pin for all reset signals which makes difficult the process of distinguishing reset signals one from another.
- the present invention provides a microcomput ⁇ er having a processor arranged to operate with a first reset signal, a power supply arrangement for supplying the processor with a further reset signal via an input and with power, a store, the contents of which are refreshed by the processor on receipt of a further reset signal by the processor, and means for distin ⁇ guishing between a first reset signal and a further reset signal, characterised in that a signal indicative of a further reset signal is fed to a further input of the processor and the processor is arranged to monitor both the inputs in order to distinguish between a cyclic reset signal and a further reset signal.
- a microcomputer 10 receives power from regu- lator unit 11.
- the regulator 11 is also assumed to provide one or more reset signals to the microcomputer 10 via a reset output 11a.
- the most usual reset from the regulator 11 is a power ON reset which is recognised by the microcomputer and used to control refreshing of a RAM 12 associated with the microcomputer 10. It is also possible for there to be generated other reset signals on the reset output 11a e.g. undervoltage reset, as long as all such reset signals should result in the RAM being refreshed with initial data.
- the microcomputer is arranged to operate normally with a cyclic reset in which case the contents of the RAM 12 should not be refreshed.
- the microcomputer 10 has only one reset pin 14 and so both cyclic and other reset signals are fed to the pin 1 .
- This is represented in the drawing by an OR gate 15 having one input 16 connected to the reset output 11a of the regulator unit and the other input 17 arranged to receive the cyclic reset signal.
- a storage element 20 is connected between the reset signal output 11a and a pin 21 of an input part of the microcomputer.
- the arithmetic program of the microprocessor interrogates the in ⁇ put part to determine whether or not a signal is pres ⁇ ent at the pin 21 indicating the fact that the reset signal is not a cyclic reset signal. If there is a signal present at the pin 21 then the microcomputer causes the RAM 12 to be refreshed with initial data; if no signal is present the microcomputer knows that the reset was a cyclic reset signal and operates accord ⁇ ingly.
- reset signals other than cyclic resets which must be distinguished from restes which require reloading of the memory e.g. watchdog circuit signals which are produced when a regular signal from the microprocessor is not received by the watchdog circuit.
- the above arrangement provides a reliable way for distinguishing between reset signals and so avoid errors.
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Debugging And Monitoring (AREA)
- Microcomputers (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19880903791 EP0409830A1 (en) | 1988-04-14 | 1988-04-14 | Microcomputer with reset signal distinguishing means |
JP88503603A JPH03503689A (en) | 1988-04-14 | 1988-04-14 | Microcomputer with reset signal identification device |
PCT/EP1988/000314 WO1989009957A1 (en) | 1988-04-14 | 1988-04-14 | Microcomputer with reset signal distinguishing means |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP1988/000314 WO1989009957A1 (en) | 1988-04-14 | 1988-04-14 | Microcomputer with reset signal distinguishing means |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1989009957A1 true WO1989009957A1 (en) | 1989-10-19 |
Family
ID=8165261
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1988/000314 WO1989009957A1 (en) | 1988-04-14 | 1988-04-14 | Microcomputer with reset signal distinguishing means |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0409830A1 (en) |
JP (1) | JPH03503689A (en) |
WO (1) | WO1989009957A1 (en) |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0437400A1 (en) * | 1990-01-12 | 1991-07-17 | Valeo Securite Habitacle | Method and device for associating the reception of restarting pulses for a microprocessor, to the access to different subprograms |
DE4112334A1 (en) * | 1991-04-16 | 1992-10-22 | Bosch Gmbh Robert | Multiprocessor system for control of motor vehicle - provides functions for ABS and engine operation controlled with monitoring to identify cold and warm start conditions following fault identification |
EP0658973A1 (en) * | 1993-12-03 | 1995-06-21 | PAPST-MOTOREN GMBH & CO. KG | Electric motor and method to control the same |
EP0665488A2 (en) * | 1994-01-27 | 1995-08-02 | Rockwell International Corporation | Supply sensing circuit with power-on reset detection |
DE4409286C1 (en) * | 1994-03-18 | 1995-08-10 | Audi Ag | Method detecting cause of reset in microprocessor controlled system |
WO1997017647A1 (en) * | 1995-11-08 | 1997-05-15 | Advanced Micro Devices, Inc. | A core section having asynchronous partial reset |
GB2313932A (en) * | 1996-06-03 | 1997-12-10 | Samsung Electronics Co Ltd | Intelligent volatile memory initialization |
US5898232A (en) * | 1995-11-08 | 1999-04-27 | Advanced Micro Devices, Inc. | Input/output section of an integrated circuit having separate power down capability |
DE10306553A1 (en) * | 2003-02-17 | 2004-09-02 | Siemens Ag | Control device for motor vehicle, has AND-gate which when reset, opens switch via which capacitor is charged to onboard voltage |
DE10329196A1 (en) * | 2003-06-28 | 2005-01-20 | Audi Ag | Reset method for a vehicle electronic control unit in which the unit is monitored by a central control unit and when a fault condition is detected it is reset by a reset command being applied to a reset trigger unit |
DE10143454B4 (en) * | 2001-02-06 | 2006-05-11 | Mitsubishi Denki K.K. | Device for controlling a vehicle |
EP3051381A3 (en) * | 2015-01-11 | 2016-11-02 | Storeone Ltd. | Method of controlling volatile memory and system thereof |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2101777A (en) * | 1978-07-21 | 1983-01-19 | Tandy Corp | Computer |
US4410991A (en) * | 1981-06-03 | 1983-10-18 | Gte Laboratories Incorporated | Supervisory control apparatus |
JPS59218525A (en) * | 1983-05-27 | 1984-12-08 | Maitetsuku:Kk | Personal computer having reset function |
-
1988
- 1988-04-14 WO PCT/EP1988/000314 patent/WO1989009957A1/en not_active Application Discontinuation
- 1988-04-14 JP JP88503603A patent/JPH03503689A/en active Pending
- 1988-04-14 EP EP19880903791 patent/EP0409830A1/en not_active Ceased
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2101777A (en) * | 1978-07-21 | 1983-01-19 | Tandy Corp | Computer |
US4410991A (en) * | 1981-06-03 | 1983-10-18 | Gte Laboratories Incorporated | Supervisory control apparatus |
JPS59218525A (en) * | 1983-05-27 | 1984-12-08 | Maitetsuku:Kk | Personal computer having reset function |
Non-Patent Citations (2)
Title |
---|
IBM Technical Disclosure Bulletin, vol. 25, no. 4, September 1982 (New York, US) J.D. Huntley et al.: "Controlling selective resets" page 2083 * |
Patent Abstracts of Japan, vol. 9, no. 90 (P-350)(1813), 19 April 1985; & JP-A-59-218525 (YOSHIDA) 8 December 1984 * |
Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2657181A1 (en) * | 1990-01-12 | 1991-07-19 | Neiman Sa | METHOD AND DEVICE FOR ASSOCIATING THE RECEPTION OF MICROPROCESSOR RESET PULSES WITH ACCESS TO DIFFERENT SUBPROGRAMS |
US5386576A (en) * | 1990-01-12 | 1995-01-31 | Valeo Neiman | Method and apparatus for associating the reception of reset pulses by a microprocessor with access to different subprograms |
EP0437400A1 (en) * | 1990-01-12 | 1991-07-17 | Valeo Securite Habitacle | Method and device for associating the reception of restarting pulses for a microprocessor, to the access to different subprograms |
DE4112334A1 (en) * | 1991-04-16 | 1992-10-22 | Bosch Gmbh Robert | Multiprocessor system for control of motor vehicle - provides functions for ABS and engine operation controlled with monitoring to identify cold and warm start conditions following fault identification |
US5367665A (en) * | 1991-04-16 | 1994-11-22 | Robert Bosch Gmbh | Multi-processor system in a motor vehicle |
US5590235A (en) * | 1993-12-03 | 1996-12-31 | Papst-Motoren Gmbh & Co. Kg | DC motor control with periodic reset |
EP0658973A1 (en) * | 1993-12-03 | 1995-06-21 | PAPST-MOTOREN GMBH & CO. KG | Electric motor and method to control the same |
EP0665488A2 (en) * | 1994-01-27 | 1995-08-02 | Rockwell International Corporation | Supply sensing circuit with power-on reset detection |
EP0665488A3 (en) * | 1994-01-27 | 1999-01-27 | Rockwell International Corporation | Supply sensing circuit with power-on reset detection |
DE4409286C1 (en) * | 1994-03-18 | 1995-08-10 | Audi Ag | Method detecting cause of reset in microprocessor controlled system |
WO1997017647A1 (en) * | 1995-11-08 | 1997-05-15 | Advanced Micro Devices, Inc. | A core section having asynchronous partial reset |
US5898232A (en) * | 1995-11-08 | 1999-04-27 | Advanced Micro Devices, Inc. | Input/output section of an integrated circuit having separate power down capability |
US6067627A (en) * | 1995-11-08 | 2000-05-23 | Advanced Micro Devices, Inc. | Core section having asynchronous partial reset |
US5860125A (en) * | 1995-11-08 | 1999-01-12 | Advanced Micro Devices, Inc. | Integrated circuit including a real time clock, configuration RAM, and memory controller in a core section which receives an asynchronous partial reset and an asynchronous master reset |
GB2313932A (en) * | 1996-06-03 | 1997-12-10 | Samsung Electronics Co Ltd | Intelligent volatile memory initialization |
US5960195A (en) * | 1996-06-03 | 1999-09-28 | Samsung Electronics Co., Ltd. | Intelligent volatile memory initialization |
GB2313932B (en) * | 1996-06-03 | 1998-08-19 | Samsung Electronics Co Ltd | Intelligent volatile memory initialisation |
DE10143454B4 (en) * | 2001-02-06 | 2006-05-11 | Mitsubishi Denki K.K. | Device for controlling a vehicle |
DE10306553A1 (en) * | 2003-02-17 | 2004-09-02 | Siemens Ag | Control device for motor vehicle, has AND-gate which when reset, opens switch via which capacitor is charged to onboard voltage |
DE10306553B4 (en) * | 2003-02-17 | 2005-11-24 | Siemens Ag | Control device for motor vehicles and method for operating a control device |
DE10329196A1 (en) * | 2003-06-28 | 2005-01-20 | Audi Ag | Reset method for a vehicle electronic control unit in which the unit is monitored by a central control unit and when a fault condition is detected it is reset by a reset command being applied to a reset trigger unit |
EP3051381A3 (en) * | 2015-01-11 | 2016-11-02 | Storeone Ltd. | Method of controlling volatile memory and system thereof |
US9563381B2 (en) | 2015-01-11 | 2017-02-07 | Storone Ltd. | Method of controlling volatile memory and system thereof |
Also Published As
Publication number | Publication date |
---|---|
EP0409830A1 (en) | 1991-01-30 |
JPH03503689A (en) | 1991-08-15 |
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