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Method for monitoring microprocessor and circuit device with microprocessor

A technology of microprocessors and circuit devices, which is applied in the fields of electrical digital data processing, instruments, hardware monitoring, etc., can solve the problems of increased manufacturing costs, increased manufacturing costs of monitors, and complex structures.

Inactive Publication Date: 2004-04-28
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

[0005] The disadvantage of the known prior art is that both measures lead to increased production costs and complex construction of the monitor
First, the equipment of 2 monitors and their mutual monitoring greatly increase the manufacturing cost, and second, the improved monitor can not only monitor the upper limit but also monitor the lower limit, compared with the monitor that only has the upper limit of the monitoring time interval, the manufacturing cost is greatly increased up

Method used

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  • Method for monitoring microprocessor and circuit device with microprocessor
  • Method for monitoring microprocessor and circuit device with microprocessor
  • Method for monitoring microprocessor and circuit device with microprocessor

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Embodiment Construction

[0021] 1 and 2 show flow charts of the method according to the invention and are explained in each case by means of the associated check function process. Here, according to the method shown in Figure 1 with a binary counter, and according to figure 2 In the method shown, the counter has a length of 2 bits, ie a total of 4 counter states can be distinguished. The method shown in FIG. 1 is suitable for detecting a malfunction of the monitor and an excessively high clock frequency of the microprocessor, but cannot distinguish between the two errors. In contrast, using figure 2 The described method then makes it possible to differentiate between the individual fault causes.

[0022] FIG. 1 shows a flow chart of the checking function of the method according to the invention for monitoring a microprocessor. The process of verifying the function shown in Figure 1 is performed when the microprocessor is in the proper working state. This then applies in particular to the situation...

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Abstract

A method for monitoring a microprocessor and a circuit arrangement having a microprocessor are described. A microprocessor is monitored using an assigned watchdog. The watchdog monitors whether reset pulses are received within a time interval of predetermined duration. If the reset pulse is received, the time interval is reset and restarted. If reset pulses are not received, a reset of the microprocessor is initiated. In suitable operating phases of the microprocessor, a check function of the watchdog is activated. During the execution of the check function, first a reset of the watchdog is executed and then a sequence of waiting loops, whose duration is greater than the duration of the time interval of the watchdog, is executed.

Description

technical field [0001] The invention relates to a method for monitoring a microprocessor and a circuit arrangement with a microprocessor. Background technique [0002] It is known to monitor the functions of a microprocessor by a so-called monitor, which is also understood to be a microcontroller within the meaning of this application. These monitors are circuitry assigned to the microprocessor which checks whether the microprocessor generates a reset pulse within an interval of a predetermined time delay. The periodic generation of reset pulses proves that the microprocessor is functioning properly. A reset of the microprocessor can be performed in the absence of a reset pulse, whereby the microprocessor is restored to an orderly state. [0003] For example, it is known from DE 43 30 940 A1 to check the function of a monitor using a second monitor. For this, one of the monitors is alternately intervened by the microprocessor, which checks whether the other monitor will r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F11/00G06F11/30
CPCG06F11/0757
Inventor J·施尔D·福斯特纳
Owner ROBERT BOSCH GMBH
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