JPS5515559A - Test input circuit of microcomputer - Google Patents
Test input circuit of microcomputerInfo
- Publication number
- JPS5515559A JPS5515559A JP8818078A JP8818078A JPS5515559A JP S5515559 A JPS5515559 A JP S5515559A JP 8818078 A JP8818078 A JP 8818078A JP 8818078 A JP8818078 A JP 8818078A JP S5515559 A JPS5515559 A JP S5515559A
- Authority
- JP
- Japan
- Prior art keywords
- level
- signal
- terminal
- test
- output
- 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
Links
Landscapes
- Test And Diagnosis Of Digital Computers (AREA)
Abstract
PURPOSE: To reduce the cost with test-only terminals reduced in number by using a terminal, assigned only for output processing when an user uses it, as a microcomputer chip test input terminal at the time of factory forwarding.
CONSTITUTION: Synchronizing-signal output terminals 2 of one-chip microcomputer 1 are used as output-only terminals when an user uses it. Synchronizing with the instruction of microcomputer 1, synchronizing signal (c) drives driver 3 and when signal (c) becomes high in level, a low-level output appears at terminal 2. With signal (c) at a low level, terminal 2 is high in level, a high level is latched to FF5 output latch signal (b), and mode signal (a) becomes low in level, showing an unpassive state. At the time of factory forwarding, LSI tester 6 is connected to terminal 2 and when inputting test-mode request signal (d) makes driver 9 conductive, terminal 2 becomes low in level, so that a low level will be latched FF5 by latch signal (b). After test mode signal (a) is made high in level to obtain a passive state, test information can be inputted from terminal.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP53088180A JPS5936305B2 (en) | 1978-07-18 | 1978-07-18 | Microcomputer test input circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP53088180A JPS5936305B2 (en) | 1978-07-18 | 1978-07-18 | Microcomputer test input circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5515559A true JPS5515559A (en) | 1980-02-02 |
| JPS5936305B2 JPS5936305B2 (en) | 1984-09-03 |
Family
ID=13935699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP53088180A Expired JPS5936305B2 (en) | 1978-07-18 | 1978-07-18 | Microcomputer test input circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5936305B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS575164A (en) * | 1980-06-11 | 1982-01-11 | Mitsubishi Electric Corp | Test input circuit of microcomputer |
| JPS585809A (en) * | 1981-07-03 | 1983-01-13 | Canon Inc | Confirmation device for circuit output |
| JPS58115555A (en) * | 1981-12-29 | 1983-07-09 | Matsushita Electric Ind Co Ltd | Test input circuit for microcomputer |
| JPS59173496U (en) * | 1983-04-30 | 1984-11-20 | オンキヨー株式会社 | Amplifier circuit for stepping motor drive circuit |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61182704U (en) * | 1985-05-01 | 1986-11-14 |
-
1978
- 1978-07-18 JP JP53088180A patent/JPS5936305B2/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS575164A (en) * | 1980-06-11 | 1982-01-11 | Mitsubishi Electric Corp | Test input circuit of microcomputer |
| JPS585809A (en) * | 1981-07-03 | 1983-01-13 | Canon Inc | Confirmation device for circuit output |
| JPS58115555A (en) * | 1981-12-29 | 1983-07-09 | Matsushita Electric Ind Co Ltd | Test input circuit for microcomputer |
| JPS59173496U (en) * | 1983-04-30 | 1984-11-20 | オンキヨー株式会社 | Amplifier circuit for stepping motor drive circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5936305B2 (en) | 1984-09-03 |
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