JPH01173857U - - Google Patents
Info
- Publication number
- JPH01173857U JPH01173857U JP6216588U JP6216588U JPH01173857U JP H01173857 U JPH01173857 U JP H01173857U JP 6216588 U JP6216588 U JP 6216588U JP 6216588 U JP6216588 U JP 6216588U JP H01173857 U JPH01173857 U JP H01173857U
- Authority
- JP
- Japan
- Prior art keywords
- data
- mpu
- control circuit
- hereinafter referred
- transmitting device
- 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.)
- Pending
Links
- 230000002093 peripheral effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
Description
第１図は本案の構成を示すブロツク図、第２図
は従来装置の構成を示すブロツク図、第３図は本
案実施例のセントロニクス仕様プリンタのデータ
送信装置の構成を示すブロツク図である。
１……データの送信を行うＭＰＵ、２……送信
データを記憶するデータバツフア、３……Ｉ／Ｏ
バス制御回路、４……送信されたデータの処理を
行うＩ／Ｏ、５……データカウンタ、６……デー
タ送信を行うデータバス、７……バツフアからＩ
／Ｏに対してデータを送るためのデータバス、８
……ＭＰＵ側からバツフアの制御を行うための制
御信号、９……データ読出し及びデータの送信を
行うための制御信号、１０……セントロニクス仕
様プリンタ、１１……アドレスデコーダ、１２…
…ライトイネーブル信号、１３……データを送信
したことを示すストローブ信号、１４……次のデ
ータを受信可能となつたことを示すアクノリツジ
信号、１５……読出し可能となつたことを示すリ
ードイネーブル信号。
FIG. 1 is a block diagram showing the configuration of the present invention, FIG. 2 is a block diagram showing the configuration of a conventional device, and FIG. 3 is a block diagram showing the configuration of a data transmission device of a Centronics specification printer according to an embodiment of the present invention. 1...MPU that transmits data, 2...Data buffer that stores transmitted data, 3...I/O
Bus control circuit, 4... I/O for processing transmitted data, 5... Data counter, 6... Data bus for data transmission, 7... I/O from buffer
Data bus for sending data to /O, 8
... Control signal for controlling the buffer from the MPU side, 9 ... Control signal for reading data and transmitting data, 10 ... Centronics specification printer, 11 ... Address decoder, 12 ...
...Write enable signal, 13...Strobe signal indicating that data has been transmitted, 14...Acknowledge signal indicating that next data can be received, 15...Read enable signal indicating that reading is possible. .
Claims (1)
書込み可能な複数バイトのデータバツフアと、デ
ータバツフアからデータを読出し、データの処理
を行う周辺装置（以後Ｉ／Ｏと呼ぶ）の動作タイ
ミングに従い、Ｉ／Ｏに対しデータ送信を行う制
御回路から構成されるデータ送信装置において、
制御回路がＩ／Ｏに対し、データの送信を行う毎
に、内容の更新を行い、ＭＰＵからその内容を随
時読出すことが可能なカウンタを設けたことを特
徴とするデータ送信装置。 According to the operation timing of the multi-byte data buffer that can be written to by the main processor (hereinafter referred to as MPU) and the peripheral device (hereinafter referred to as I/O) that reads data from the data buffer and processes the data, the I/O On the other hand, in a data transmitting device consisting of a control circuit that transmits data,
A data transmitting device comprising a counter that updates contents every time a control circuit transmits data to an I/O and can read the contents from an MPU at any time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6216588U JPH01173857U (en) | 1988-05-13 | 1988-05-13 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6216588U JPH01173857U (en) | 1988-05-13 | 1988-05-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01173857U true JPH01173857U (en) | 1989-12-11 |
Family
ID=31287797
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6216588U Pending JPH01173857U (en) | 1988-05-13 | 1988-05-13 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01173857U (en) |
-
1988
- 1988-05-13 JP JP6216588U patent/JPH01173857U/ja active Pending
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