JPS57155656A - One-chip microcomputer - Google Patents

One-chip microcomputer

Info

Publication number
JPS57155656A
JPS57155656A JP56040801A JP4080181A JPS57155656A JP S57155656 A JPS57155656 A JP S57155656A JP 56040801 A JP56040801 A JP 56040801A JP 4080181 A JP4080181 A JP 4080181A JP S57155656 A JPS57155656 A JP S57155656A
Authority
JP
Japan
Prior art keywords
register
data
contents
cpu12
same
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
JP56040801A
Other languages
Japanese (ja)
Other versions
JPS6243229B2 (en
Inventor
Joji Murakami
Takeshi Watabe
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP56040801A priority Critical patent/JPS57155656A/en
Priority to DE8282301445T priority patent/DE3273507D1/en
Priority to EP82301445A priority patent/EP0062431B1/en
Priority to US06/359,818 priority patent/US4467420A/en
Priority to IE662/82A priority patent/IE53423B1/en
Publication of JPS57155656A publication Critical patent/JPS57155656A/en
Publication of JPS6243229B2 publication Critical patent/JPS6243229B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F15/00—Digital computers in general; Data processing equipment in general
    • G06F15/76—Architectures of general purpose stored program computers
    • G06F15/78—Architectures of general purpose stored program computers comprising a single central processing unit
    • G06F15/7839—Architectures of general purpose stored program computers comprising a single central processing unit with memory
    • G06F15/7842—Architectures of general purpose stored program computers comprising a single central processing unit with memory on one IC chip (single chip microcontrollers)
    • G06F15/786—Architectures of general purpose stored program computers comprising a single central processing unit with memory on one IC chip (single chip microcontrollers) using a single memory module

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Debugging And Monitoring (AREA)
  • Test And Diagnosis Of Digital Computers (AREA)
  • Microcomputers (AREA)

Abstract

PURPOSE:To extract the contents of an RAM to the outside by use of a small number of terminal pins, by arranging a register and a controller to a chip of a microcomputer containing an RAM and at the same time writing the prescribed data same as the RAM into the register. CONSTITUTION:A memory region 14a into which a data to monitor the working of a CPU12 is written, a register 22 that writes a data same as the region 14a plus a control circuit 24 that controls the register 22 are included in an RAM14 of a semiconductor chip 10. The CPU12, when writing the result of operation, etc. into the region 14a, writes the data also into the register 22 via the circuit 24. The register 22 is always replaced and holds the same contents as the region 14a. When the data is sent to outside, the CPU12 gives a DMA command to the circuit 24, transfers the contents of the register 22 to a transmitting register 20 and reads successively the contents of the register 22 with the same clock as that used for a serial I/O18 to transmit the contents in series to outside. The data can be transmitted quickly with just a single terminal pin and with a DMA command given to the circuit 24 from the CPU12.
JP56040801A 1981-03-20 1981-03-20 One-chip microcomputer Granted JPS57155656A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP56040801A JPS57155656A (en) 1981-03-20 1981-03-20 One-chip microcomputer
DE8282301445T DE3273507D1 (en) 1981-03-20 1982-03-19 A one chip microcomputer
EP82301445A EP0062431B1 (en) 1981-03-20 1982-03-19 A one chip microcomputer
US06/359,818 US4467420A (en) 1981-03-20 1982-03-19 One-chip microcomputer
IE662/82A IE53423B1 (en) 1981-03-20 1982-03-22 A one chip microcomputer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56040801A JPS57155656A (en) 1981-03-20 1981-03-20 One-chip microcomputer

Publications (2)

Publication Number Publication Date
JPS57155656A true JPS57155656A (en) 1982-09-25
JPS6243229B2 JPS6243229B2 (en) 1987-09-11

Family

ID=12590728

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56040801A Granted JPS57155656A (en) 1981-03-20 1981-03-20 One-chip microcomputer

Country Status (1)

Country Link
JP (1) JPS57155656A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57182855A (en) * 1981-05-07 1982-11-10 Toshiba Corp Operation confirming system for one-chip microcomputer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57182855A (en) * 1981-05-07 1982-11-10 Toshiba Corp Operation confirming system for one-chip microcomputer

Also Published As

Publication number Publication date
JPS6243229B2 (en) 1987-09-11

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