JPS6415832A - Single-chip microcomputer - Google Patents
Single-chip microcomputerInfo
- Publication number
- JPS6415832A JPS6415832A JP62172189A JP17218987A JPS6415832A JP S6415832 A JPS6415832 A JP S6415832A JP 62172189 A JP62172189 A JP 62172189A JP 17218987 A JP17218987 A JP 17218987A JP S6415832 A JPS6415832 A JP S6415832A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- test mode
- register
- rom
- counter
- 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)
- Microcomputers (AREA)
Abstract
PURPOSE:To automatically set again an external test mode immediately after the internal information of a ROM is confirmed by checking the confirmation of said internal information by an extent equal to the value set at a modulo register. CONSTITUTION:In an external test mode a mode register 3 is set by a set signal 2 produced by an external instruction and a start signal 4 is active. Then a test mode of a ROM is set via an AND circuit 5 and a switch circuit 7. The internal information of a ROM 6 is delivered to an output port 8 synchronously with a system clock 11 and can be confirmed. At the same time, a counter 12 starts its counting action synchronously with the clock 11 when the signal 4 becomes active. A coincidence detecting circuit 14 produces a coincidence signal 15 when the coincidence is obtained between the value set at a modulo register 13 and the count value of the counter 12 and clears the register 3 via an OR circuit 16. The signal 4 clears the counter 12 and sets again an external test mode.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62172189A JPH0646388B2 (en) | 1987-07-10 | 1987-07-10 | Single chip microcomputer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62172189A JPH0646388B2 (en) | 1987-07-10 | 1987-07-10 | Single chip microcomputer |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6415832A true JPS6415832A (en) | 1989-01-19 |
JPH0646388B2 JPH0646388B2 (en) | 1994-06-15 |
Family
ID=15937227
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62172189A Expired - Lifetime JPH0646388B2 (en) | 1987-07-10 | 1987-07-10 | Single chip microcomputer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0646388B2 (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5835661A (en) * | 1981-08-27 | 1983-03-02 | Toshiba Corp | One-chip microcomputer |
-
1987
- 1987-07-10 JP JP62172189A patent/JPH0646388B2/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5835661A (en) * | 1981-08-27 | 1983-03-02 | Toshiba Corp | One-chip microcomputer |
Also Published As
Publication number | Publication date |
---|---|
JPH0646388B2 (en) | 1994-06-15 |
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