JPH01177121A - Serial communication system for a/d converter - Google Patents

Serial communication system for a/d converter

Info

Publication number
JPH01177121A
JPH01177121A JP63001563A JP156388A JPH01177121A JP H01177121 A JPH01177121 A JP H01177121A JP 63001563 A JP63001563 A JP 63001563A JP 156388 A JP156388 A JP 156388A JP H01177121 A JPH01177121 A JP H01177121A
Authority
JP
Japan
Prior art keywords
conversion
data
converter
level
terminal
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
JP63001563A
Other languages
Japanese (ja)
Other versions
JPH0570169B2 (en
Inventor
Hirobumi Higashida
東田　博文
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Denso Ten Ltd
Original Assignee
Denso Ten Ltd
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 Denso Ten Ltd filed Critical Denso Ten Ltd
Priority to JP63001563A priority Critical patent/JPH01177121A/en
Publication of JPH01177121A publication Critical patent/JPH01177121A/en
Publication of JPH0570169B2 publication Critical patent/JPH0570169B2/ja
Granted legal-status Critical Current

Links

Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P30/00—Technologies relating to oil refining and petrochemical industry
    • Y02P30/20—Technologies relating to oil refining and petrochemical industry using bio-feedstock

Landscapes

  • Analogue/Digital Conversion (AREA)

Abstract

PURPOSE:To avoid reception of the undesired A/D conversion data by sending the permitting and inhibiting instructions to an A/D converter from a processor for the A/D conversion. CONSTITUTION:The permission/inhibition of the A/D conversion is controlled at the level of a terminal A of a processor 2. The level of the terminal A is switched between H (high) and L (low) levels by a program of the processor 2. Thus the terminal A is set at an L level (output of a permitting instruction) right before transmission of the request channel data and then at an H level (output of an inhibiting instruction) right after reception of the A/D conversion data respectively. Thus no A/D conversion is carried out even though the noise is put on the line of a request channel with the terminal A set at an H level and turned into a start signal since an A/D converter 1 is not activated. Then it is possible to prevent such a harmful process where the data are broken in a RAM 21 after the undesired A/D conversion data is received by the processor 2.

Description

【発明の詳細な説明】 〔概　要〕 処理装置からＡＤ　（アナログ／デジタル）変換装置に
対しＡＤ変換を許可する命令と禁止する命令を送り、不
要なＡＤ変換データの受信を防止する。[Detailed Description of the Invention] [Summary] A processing device sends an instruction to permit AD conversion and a command to prohibit AD conversion to an AD (analog/digital) conversion device, thereby preventing reception of unnecessary AD conversion data.

〔産業上の利用分野〕[Industrial application field]

本発明は、ＡＤ変換装置から必要時にＡＤ変換データを
受信するシリアル通信方式に関する。The present invention relates to a serial communication method for receiving AD conversion data from an AD conversion device when necessary.

〔従来の技術〕[Conventional technology]

多チャンネルのＡＤ変換装置から必要時に要求チャンネ
ルのＡＤ変換データだけを受信するシリアル通信方式で
は、処理装置からの要求チャンネルデータの送信がＡＤ
変換開始信号ともなるため、その信号ラインに電気的な
ノイズが混入した場合、要求もしていないときに不要な
ＡＤ変換データが処理装置で誤受信される欠点がある。In a serial communication method that receives only AD conversion data of a requested channel from a multi-channel AD conversion device when necessary, the transmission of requested channel data from a processing device is
Since it also serves as a conversion start signal, there is a drawback that if electrical noise is mixed into the signal line, unnecessary AD conversion data may be received by the processing device erroneously when it is not requested.

［発明が解決しようとする問題点〕 上述したノイズをフィルタで除去しようとしても、シリ
アル通信ではスタート信号をクロック同期で送信するた
め、該フィルタを使用することができない。[Problems to be Solved by the Invention] Even if it is attempted to remove the above-mentioned noise with a filter, the filter cannot be used in serial communication because the start signal is transmitted in synchronization with a clock.

本発明は処理装置側からＡＤ変換を許可／禁止する命令
を出すことで、不要なＡＤ変換データの誤受信を防止し
ようとするものである。The present invention attempts to prevent erroneous reception of unnecessary AD conversion data by issuing a command from the processing device side to permit/prohibit AD conversion.

〔問題点を解決するための手段〕[Means for solving problems]

本発明は、ＡＤ変換装置に要求チャンネルのデータを送
って該チャンネルのＡＤ変換データを受信する処理装置
が、該ＡＤ変換装置に対し、該要求チャンネルのデータ
を送信する直前にＡＤ変換を許可する命令を出し、また
該ＡＤ変換データを受信した直後に該ＡＤ変換を禁止す
る命令を出すことを特徴とするものである。In the present invention, a processing device that sends data of a requested channel to an AD converter and receives AD converted data of the channel allows the AD converter to perform AD conversion immediately before transmitting data of the requested channel. The present invention is characterized in that it issues a command and, immediately after receiving the AD conversion data, issues a command to inhibit the AD conversion.

〔作用〕[Effect]

ＡＤ変換装置はＡＤ変換を禁止する命令を受けた後は該
変換を許可する命令を受けるまでＡＤ変換が禁止される
。従って、その間にノイズで誤ってＡＤ変換開始が指示
されても、実際にはＡＤ変換は行われないので、処理装
置側に不要なＡＤ変換データが入力することはない。After the AD conversion device receives a command to prohibit AD conversion, AD conversion is prohibited until it receives a command to permit the conversion. Therefore, even if AD conversion is erroneously instructed to start due to noise during that time, AD conversion will not actually be performed, and unnecessary AD conversion data will not be input to the processing device side.

〔実施例〕〔Example〕

第１図は本発明の一実施例を示すシステム構成図で、ｌ
はＡＤ変換装置、２は処理装置（マイクロコンピュータ
）である。このシステムは例えばエンジン制御用で、複
数のアナログ入力チャンネルＣＨＩ、ＣＨ２，・・・・
・・（エンジン冷却水温、吸気管圧力等）の１つをマル
チプレクサ（ＭＰＸ）１１で選択してＡＤ変換器（ＡＤ
Ｃ）１２でＡＤ変換する。処理装置２はＡＤ変換データ
をシリアル通信で受信してメモリ　（ＲＡＭ）２１に取
込み、点火制御や燃料噴射制御等を行う。受信するＡＤ
変換データのチャンネルは要求チャンネルデータで指定
できる。FIG. 1 is a system configuration diagram showing an embodiment of the present invention.
2 is an AD conversion device, and 2 is a processing device (microcomputer). This system, for example for engine control, has multiple analog input channels CHI, CH2,...
... (engine coolant temperature, intake pipe pressure, etc.) is selected by the multiplexer (MPX) 11 and the AD converter (AD
C) Perform AD conversion at 12. The processing device 2 receives AD conversion data via serial communication, stores it in a memory (RAM) 21, and performs ignition control, fuel injection control, etc. AD to receive
The conversion data channel can be specified by request channel data.

この要求チャンネルデータとＡＤ変換データはいずれも
第２図に示すフォーマットの８ビツトシリアルデータで
、先端１ビツトにＬ（ロー）レベルのスタート信号５Ｔ
ＡＲＴを付し、また後端２ビツトにＨ（ハイ）レベルの
ストップ信号５ＴＯＰヲ付シである。Both the requested channel data and the AD conversion data are 8-bit serial data in the format shown in Figure 2, with a start signal 5T of L (low) level at the leading bit.
ART is attached, and a stop signal 5TOP of H (high) level is attached to the trailing 2 bits.

ＡＤ変換装置ｌはチップセレクト端子Ｃ８を有し、従来
はここを固定的に接地して常にＡ、Ｄ変換可能な状態に
している。これに対し本発明では処理装置２の端子Ａの
レベルでＡＤ変換の許可／禁止を制御する。端子Ａのレ
ベルをＨ，Ｌに切替えるのは処理装置２のプログラムで
あり、そのタイミングは第３図に示すようになる。つま
り、要求チャンネルデータを送出する直前に端子ＡをＬ
にしく許可命令を出し）、ＡＤ変換データを受信した直
後に端子ＡをＨにする（禁止命令を出す）ということで
ある。The AD converter 1 has a chip select terminal C8, which is conventionally fixedly grounded so that A and D conversion is possible at all times. On the other hand, in the present invention, permission/inhibition of AD conversion is controlled at the level of terminal A of the processing device 2. It is the program of the processing device 2 that switches the level of the terminal A between H and L, and the timing thereof is as shown in FIG. In other words, just before transmitting the requested channel data, terminal A is set to L.
Immediately after receiving the AD conversion data, terminal A is set to H (issues a prohibition command).

このようにすると端子ＡがＨレベルのときに要求チャン
ネルのラインにノイズがのり、それが第２図のスタート
信号５ＴＡＲＴの形をとっても、ＡＤ変換装置１が活性
化されていないのでＡＤ変換は行われず、従って処理装
置２が不要なＡＤ変換データを受は取って有害な処理（
例えばＲＡＭ２１内のデータ破壊）をすることが防止さ
れる。In this way, when terminal A is at H level, noise is added to the line of the requested channel, and even if it takes the form of the start signal 5TART shown in Figure 2, AD conversion is not performed because AD converter 1 is not activated. Therefore, the processing device 2 receives unnecessary AD conversion data and performs harmful processing (
For example, data destruction in the RAM 21 is prevented.

〔発明の効果〕〔Effect of the invention〕

以上述べたように本発明によれば、外部のＡＤ変換装置
からシリアル通信でＡＤ変換データを受取る処理装置が
、不要なＡＤ変換データで誤動作することを防止できる
。As described above, according to the present invention, a processing device that receives AD conversion data from an external AD conversion device via serial communication can be prevented from malfunctioning due to unnecessary AD conversion data.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明のシステム構成図、 第２図はシリアルデータの構成図、 第３図は第１図のタイムチャートである。 出　願　人　　富士通テン株式会社 代理人弁理士　　青　　柳　　　稔 FIG. 1 is a system configuration diagram of the present invention, Figure 2 is a configuration diagram of serial data, FIG. 3 is a time chart of FIG. 1. Sender: Fujitsu Ten Ltd. Representative Patent Attorney Minoru Ao Yanagi

Claims (1)

【特許請求の範囲】[Claims] １、ＡＤ変換装置に要求チャンネルのデータを送って該
チャンネルのＡＤ変換データを受信する処理装置が、該
ＡＤ変換装置に対し、該要求チャンネルのデータを送信
する直前にＡＤ変換を許可する命令を出し、また該ＡＤ
変換データを受信した直後に該ＡＤ変換を禁止する命令
を出すことを特徴とするＡＤ変換装置とのシリアル通信
方式。1. A processing device that sends data on a requested channel to an AD converter and receives AD converted data on the channel issues a command to the AD converter to permit AD conversion immediately before transmitting data on the requested channel. out, and also the AD
A serial communication method with an AD converter, characterized in that immediately after receiving converted data, a command to inhibit the AD conversion is issued.
JP63001563A 1988-01-07 1988-01-07 Serial communication system for a/d converter Granted JPH01177121A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63001563A JPH01177121A (en) 1988-01-07 1988-01-07 Serial communication system for a/d converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63001563A JPH01177121A (en) 1988-01-07 1988-01-07 Serial communication system for a/d converter

Publications (2)

Publication Number Publication Date
JPH01177121A true JPH01177121A (en) 1989-07-13
JPH0570169B2 JPH0570169B2 (en) 1993-10-04

Family

ID=11504990

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63001563A Granted JPH01177121A (en) 1988-01-07 1988-01-07 Serial communication system for a/d converter

Country Status (1)

Country Link
JP (1) JPH01177121A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016128967A (en) * 2015-01-09 2016-07-14 住友電気工業株式会社 Electronic apparatus
JP2017101388A (en) * 2015-11-30 2017-06-08 株式会社奥村組 Excavator with data transfer device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6286733U (en) * 1985-11-20 1987-06-03

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6286733U (en) * 1985-11-20 1987-06-03

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016128967A (en) * 2015-01-09 2016-07-14 住友電気工業株式会社 Electronic apparatus
JP2017101388A (en) * 2015-11-30 2017-06-08 株式会社奥村組 Excavator with data transfer device

Also Published As

Publication number Publication date
JPH0570169B2 (en) 1993-10-04

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