JPS63143953U - - Google Patents
Info
- Publication number
- JPS63143953U JPS63143953U JP1987034656U JP3465687U JPS63143953U JP S63143953 U JPS63143953 U JP S63143953U JP 1987034656 U JP1987034656 U JP 1987034656U JP 3465687 U JP3465687 U JP 3465687U JP S63143953 U JPS63143953 U JP S63143953U
- Authority
- JP
- Japan
- Prior art keywords
- microcomputer
- flag
- rom
- program
- contents
- 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
- 239000004065 semiconductor Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 1
Description
第１図は本考案の実施例１のブロツク図でマイ
コンのブロツクの１部を示し、第２図は実施例２
のブロツク図である。
１……許可フラグ、２……データバス、３……
リセツト回路、４……プログラムメモリ用ＲＯＭ
読み出し制御回路、５……データメモリ用ＲＡＭ
、６……許可フラグ用ＲＡＭ、７……アドレスバ
ス、８……アドレスデコーダ。
Figure 1 is a block diagram of Embodiment 1 of the present invention, showing part of the microcomputer block, and Figure 2 is Embodiment 2 of the present invention.
FIG. 1...Permission flag, 2...Data bus, 3...
Reset circuit, 4...ROM for program memory
Read control circuit, 5... RAM for data memory
, 6... RAM for permission flag, 7... Address bus, 8... Address decoder.
Claims (1)
イクロコンピユータ等の半導体デバイスにおいて
、ソフトウエアにて書き換え可能な少なくとも１
ビツトのフラグを有し、該フラグの設定値によつ
てプログラムメモリ用ＲＯＭの内容の外部読み出
しを可能とすることができることを特徴とするマ
イクロコンピユータ。 In a semiconductor device such as a microcomputer that has a program ROM and an arithmetic processing function, at least one
A microcomputer characterized in that it has a bit flag, and the contents of a program memory ROM can be read externally depending on the setting value of the flag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987034656U JPS63143953U (en) | 1987-03-09 | 1987-03-09 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987034656U JPS63143953U (en) | 1987-03-09 | 1987-03-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63143953U true JPS63143953U (en) | 1988-09-21 |
Family
ID=30843420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987034656U Pending JPS63143953U (en) | 1987-03-09 | 1987-03-09 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63143953U (en) |
-
1987
- 1987-03-09 JP JP1987034656U patent/JPS63143953U/ja active Pending
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