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Analog/digital conversion circuit, semiconductor device, and electric power steering controlling unit

a technology of analog/digital converter and control unit, which is applied in the direction of steering initiation, instruments, vessel construction, etc., can solve the problems of consuming spare time of cpu, increasing the load on signal control process, and disadvantageous analog/digital conversion process in a short period in single scan mode of analog/digital converter, so as to reduce the process of firmwar

Inactive Publication Date: 2012-10-11
RENESAS ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]An object of the present invention is to provide a method in which a counting source is provided in data after analog / digital conversion to lessen a load placed when new and old data after the conversion are compared to each other.
[0017]It is possible to determine new or old data only by comparing the data to each other by using the analog / digital conversion circuit according to the representative embodiment of the present invention. Accordingly, it is possible to reduce processes of firmware which searches a ring buffer to determine new or old data and a CPU which operates the firmware.

Problems solved by technology

Further, an analog / digital conversion process in a short period in the single scan mode by the analog / digital converter disadvantageously consumes the spare time of a CPU.
Thus, a load on the signal controlling process is increased, and the spare time of the CPU is consumed in this point, too.

Method used

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  • Analog/digital conversion circuit, semiconductor device, and electric power steering controlling unit
  • Analog/digital conversion circuit, semiconductor device, and electric power steering controlling unit
  • Analog/digital conversion circuit, semiconductor device, and electric power steering controlling unit

Examples

Experimental program
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first embodiment

[0028]FIG. 1 is a conceptual diagram for explaining where an analog / digital conversion circuit according to the present invention is used in an actual LSI (semiconductor device). It should be noted that the LSI is supposedly used for an automobile.

[0029]The LSI is comprised of a CPU 101, a BSC 102, a DMAC 103, a FLASH 104, a RAM 105, an INTC 106, a WDT 107, a CAN 108, an SCIF 109, an I2C 110, an A / D 111, a D / A 112, a CMT 113, an MTU 114, and an I / O port 115.

[0030]The CPU (Central Processing Unit) 101 is a CPU core including a central processing unit and peripheral circuits.

[0031]The BSC (Bus State Controller) 102 is a bus controller for controlling an internal bus of the LSI.

[0032]The DMAC (Direct Memory Access Controller) 103 is a DMA controller used when data are transmitted or received via the internal bus of the LSI without occupying the CPU 101.

[0033]The FLASH 104 is a storage region using a Flash ROM that is a nonvolatile semiconductor memory. Further, the RAM 105 is a storage...

second embodiment

[0114]Next, a second embodiment of the present invention will be described.

[0115]FIG. 8 is a block diagram for showing a configuration of an analog / digital conversion circuit according to the second embodiment of the present invention.

[0116]In the first embodiment, a part of the value of the timer counter TCNT of the MTU 114 is used as a log. On the contrary, a dedicated analog / digital conversion counting function 206-3 is provided in the A / D conversion controlling circuit 206 in the second embodiment. In addition, an A / D conversion count register group 214 for recording the number of counts is provided. The second embodiment is characterized in that these units are operated in cooperation with the log function 206-2.

[0117]These additional features will be described.

[0118]The followings are functions of the analog / digital conversion counting function 206-3: 1) the value of an appropriate counter register in the A / D conversion count register group 214 is read in accordance with an in...

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Abstract

The present invention provides a method in which a counting source is provided in data after analog / digital conversion to lessen a load placed when new and old data after the conversion are compared to each other. A log function is prepared in an A / D conversion controlling circuit. The log function latches the output of a counter in a 12-bit digital / analog converter at the timing of outputting a pulse from a comparator to determine data written into a data register group. In the case where a setting item related to log output in an ADCR is set at 1, not only the output of the 12-bit digital / analog converter, but also the output of a timer counter of an MTU is latched as a log.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The disclosure of Japanese Patent Application No. 2009-184944 filed on Aug. 7, 2009 including the specification, drawings and abstract is incorporated herein by reference in its entirety.BACKGROUND OF THE INVENTION[0002]The present invention relates to management of data after being converted by an analog / digital conversion circuit, and particularly to an analog / digital conversion circuit of an in-vehicle semiconductor device for an automobile.[0003]In recent years, CPUs and DSPs are provided at every part in an automobile, and data of various events (various data) generated in the automobile are sensed by the CPUs via sensors. The various data sensed by the CPUs and the like are fed back, and the CPUs provide functions. Further, when functions are provided by other CPUs and the like, the various data are transmitted to the other CPUs and the like via an in-vehicle communication network (for example, a LAN, a CAN (Control Area Network), a...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B62D6/00
CPCB60R16/0231H03M1/1215B62D5/046
Inventor OTA, NAOYA
Owner RENESAS ELECTRONICS CORP