Horology: time measuring systems or devices – Combined with disparate device
Patent
1991-05-31
1993-08-24
Miska, Vit W.
Horology: time measuring systems or devices
Combined with disparate device
307 101, 395550, G04B 4700, B60Q 100, G06F 100
Patent
active
052395200
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention is directed to a booting or wake-up circuit for a microprocessor.
BACKGROUND
A circuit arrangement of this kind is known from German Patent 29 11 998 and corresponding WESEMEYER et al. U.S. Pat. No. 4,455,623.
Booting circuits of this kind are necessary, particularly in motor vehicles, so that the microprocessor and its peripherals are not continuously connected to the vehicle battery in the operating mode, thus discharging the battery if the vehicle is stopped for a relatively long period. On the other hand, even when the vehicle is shut off for such long times, the microprocessor must not be switched off completely, since various functions, such as tripping of the vehicle alarm system, or electric door locking can be kept operative only if they are generally controlled via the microprocessor. Similar problems generally arise in all battery-operated microprocessor systems that must trigger function processes from the state of repose.
THE INVENTION
The object of the is to develop a generic circuit referred to at the outset further in such a way that when arbitrarily many and/or different switches are triggered, or when a bus control signal is applied to a control input of the circuit arrangement, a defined signal for the microprocessor is generated.
The thus-provided triggering of he interrupt input of the microprocessor, in particular a CMOS microprocessor, makes it possible by means of the booting circuit, via an arbitrary number of key switches, to change the microprocessor from an idling or stop mode previously achieved by software into an operating mode (BOOTING).
By means of the microprocessor, a switchable voltage regulator of a voltage supply arrangement for supplying peripherals can be switched on, and it is possible to have the microprocessor run through the particular program called up by the interrupt command and in this process to read in data from a controller network, evaluate the data, and trigger the appropriate output drivers. As soon as there are no further activities occurring at the inputs and outputs of the microprocessor, this situation is recognized by the microprocessor via software and processed in such a way that after a predetermined period of time the microprocessor automatically switches back to the idle or stop mode.
Accordingly, when a motor vehicle is turned off, only the booting circuit arrangement and the microprocessor are supplied with a voltage in the standby mode, and the microprocessor itself is put in the idle or stop mode. The power takeup of the multiplex station can accordingly be reduced to a minimum by shutting off the peripherals.
With the further feature of the timer stage defined by claim 2 it is assured that the interrupt input of the microprocessor always receives a defined HIGH or LOW signal by means of the command value switch preceding it.
By means of the embodiment of claim 3 it is attained that the switching pulse for the microprocessor interrupt input has an adequate, defined length even if the trigger signal itself is only very brief or is composed of a plurality of very brief signals, for instance because of switch bounce.
According to claim 4 it is possible, by actuating a key switch, to trigger the microprocessor interrupt input and accordingly put the microprocessor in the operating mode even if some other key switch is in a permanently closed state; for instance, tripping of the alarm system is possible even if the switch associated with the central locking system is in a closed state.
By means of the embodiment of claim 5 it is possible to effect triggering of the interrupt input not only by the closure of a key switch but also by opening a certain key switch with a corresponding circuit arrangement connected to the output side.
The embodiment of claim 6 makes it possible to trigger the booting circuit, which in principle is suitable for this purpose because of the characteristics described above, by a bus activity, in other words whenever a second station is sending a data telegram.
BRIEF FIGURE D
REFERENCES:
patent: 4455623 (1984-06-01), Wesemeyer et al.
patent: 4658150 (1987-04-01), Mizuno et al.
patent: 4677308 (1987-06-01), Wroblewski et al.
patent: 4839530 (1989-06-01), Greenwood
Motorola Handbook "Microprocessor, Microcontroller, and Peripheral Data--vol. 1", 1988, pp. iii, 1-1, 1-2, and 3-393 through 3-396, describing the MC68HC04P4 Microcontroller.
Pentti Lappalainen, "A High-Performance Monostable Multivibrator," IEEE Journal of Solid-State Circuits, Aug. 1974, vol. SC-9, No. 4, pp. 190-192.
B. Spedding, "Monostable Applied to Low Power Systems," Electronic Engineering, vol. 59, No. 732, p. 27, (Dec. 1987).
WPI Abstract of German DE-3926178 of Feb. 14, 1991.
Miska Vit W.
Robert & Bosch GmbH
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