JPS6488644A - Single chip microcomputer - Google Patents
Single chip microcomputerInfo
- Publication number
- JPS6488644A JPS6488644A JP62245667A JP24566787A JPS6488644A JP S6488644 A JPS6488644 A JP S6488644A JP 62245667 A JP62245667 A JP 62245667A JP 24566787 A JP24566787 A JP 24566787A JP S6488644 A JPS6488644 A JP S6488644A
- Authority
- JP
- Japan
- Prior art keywords
- ram
- rom
- circuit
- content
- comes
- 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 execute effective dynamic BT irrespective of a program stored in a ROM by controlling so that the content on a bus read out from the ROM by a read signal is written in a RAM. CONSTITUTION:In the operation of dynamic BT, a TEST signal is shifted, from the external, to '1'. When the content in the ROM is read out on the data bus 5, a ROMRD signal comes in '1', and an output form an AND circuit 9 comes in '1'. Accordingly, an output from an OR circuit 7 comes in '1', hence a write circuit 3 turns active, and the data on the bus 5 is written in a RAM cell part 1 designated by a RAM address decoder 2. Like this, the write circuit 3 to write in the RAM writes therein extremely frequently. As a result, the RAM 1 can be operated during dynamic screening irrespective of the content in the incorporated ROM.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62245667A JPH069032B2 (en) | 1987-09-29 | 1987-09-29 | Single chip microcomputer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62245667A JPH069032B2 (en) | 1987-09-29 | 1987-09-29 | Single chip microcomputer |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6488644A true JPS6488644A (en) | 1989-04-03 |
JPH069032B2 JPH069032B2 (en) | 1994-02-02 |
Family
ID=17137023
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62245667A Expired - Lifetime JPH069032B2 (en) | 1987-09-29 | 1987-09-29 | Single chip microcomputer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH069032B2 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60254361A (en) * | 1984-05-31 | 1985-12-16 | Nec Corp | Microcomputer |
JPS6167148A (en) * | 1984-09-10 | 1986-04-07 | Nec Corp | Microcomputer |
-
1987
- 1987-09-29 JP JP62245667A patent/JPH069032B2/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60254361A (en) * | 1984-05-31 | 1985-12-16 | Nec Corp | Microcomputer |
JPS6167148A (en) * | 1984-09-10 | 1986-04-07 | Nec Corp | Microcomputer |
Also Published As
Publication number | Publication date |
---|---|
JPH069032B2 (en) | 1994-02-02 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS5582359A (en) | Microprogram test unit | |
JPS6488644A (en) | Single chip microcomputer | |
JPS5587204A (en) | Sequential controller | |
JPS57211651A (en) | Patch system | |
JPS5760441A (en) | Information processing equipment | |
JPS5616991A (en) | Semicondcutor memory unit | |
JPS55135960A (en) | Micro-computer | |
JPS56153461A (en) | Information processor | |
JPS54140444A (en) | Ratch circuit | |
JPS576927A (en) | Address allotting system | |
JPS57100691A (en) | Memory access control system | |
JPS5737795A (en) | Read-only memory element | |
JPS5785145A (en) | Address detection system | |
JPS5676821A (en) | Power supply method of storage device | |
JPS5255447A (en) | Microprocessor | |
JPS5672745A (en) | Priority circuit | |
JPS6435639A (en) | Rom/ram memory access switching circuit | |
JPS6425258A (en) | Memory access circuit | |
JPS5699550A (en) | Information processing unit | |
JPS6426950A (en) | Write protecting system for memory | |
JPS6455660A (en) | Memory circuit | |
JPS5566042A (en) | Memory control circuit | |
JPS5452430A (en) | Address switching unit | |
JPS54158829A (en) | Semiconductor memory device | |
JPS6423343A (en) | Programmable interruption signal generator |