JPH0186000U - - Google Patents
Info
- Publication number
- JPH0186000U JPH0186000U JP18209587U JP18209587U JPH0186000U JP H0186000 U JPH0186000 U JP H0186000U JP 18209587 U JP18209587 U JP 18209587U JP 18209587 U JP18209587 U JP 18209587U JP H0186000 U JPH0186000 U JP H0186000U
- Authority
- JP
- Japan
- Prior art keywords
- terminal
- microcomputer
- mode
- prom
- built
- 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
- 230000010355 oscillation Effects 0.000 description 2
Landscapes
- Microcomputers (AREA)
Description
第１図は、本考案の実施例の発振回路であり、
第２図は、本考案の他の実施例の発振回路である
。
主な参照番号、１０１……第１の端子、１０２
……第２の端子、１０３……反転信号出力手段、
１０４……モード切り替え信号入力端子、１０５
……第１の入力バツフア、１０６……第２の入力
バツフア、１０７……第１の入力信号、１０８…
…第２の入力信号、２０３……反転信号出力手段
。
FIG. 1 shows an oscillation circuit according to an embodiment of the present invention,
FIG. 2 shows an oscillation circuit according to another embodiment of the present invention. Main reference number, 101...first terminal, 102
...Second terminal, 103...Inverted signal output means,
104...Mode switching signal input terminal, 105
...First input buffer, 106...Second input buffer, 107...First input signal, 108...
...Second input signal, 203...Inverted signal output means.
Claims (1)
イクロコンピユータ動作モードとＰＲＯＭ書き込
みモードを切り替えるモード切り替え信号を発生
する手段を備えるＰＲＯＭ内蔵マイクロコンピユ
ータにおいて、第１の端子を入力端子とし、マイ
クロコンピユータ動作モード時には、第２の端子
へ該第１の端子の反転信号を出力し、ＰＲＯＭ書
き込みモード時には、該第２の端子に対しハイイ
ンピーダンス状態を出力する、上記モード切り替
え信号により制御される反転信号出力手段を具備
し、ＰＲＯＭ書き込みモード時に、全端子の機能
がＪＥＤＥＣ標準となることを特徴とするＰＲＯ
Ｍ内蔵マイクロコンピユータ。 In a microcomputer with built-in PROM, which is equipped with a means for generating a mode switching signal for switching between a microcomputer operation mode and a PROM write mode based on a voltage level applied to an arbitrary terminal, the first terminal is an input terminal, and when in the microcomputer operation mode, , an inverted signal output means controlled by the mode switching signal, which outputs an inverted signal of the first terminal to a second terminal, and outputs a high impedance state to the second terminal in a PROM write mode. PRO is equipped with the following features, and all pin functions are JEDEC standard in PROM write mode.
Built-in microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18209587U JPH0186000U (en) | 1987-11-30 | 1987-11-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18209587U JPH0186000U (en) | 1987-11-30 | 1987-11-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0186000U true JPH0186000U (en) | 1989-06-07 |
Family
ID=31473550
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18209587U Pending JPH0186000U (en) | 1987-11-30 | 1987-11-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0186000U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60256868A (en) * | 1984-06-01 | 1985-12-18 | Fujitsu Ltd | One-chip microcomputer capable of writing to incorporated eprom |
-
1987
- 1987-11-30 JP JP18209587U patent/JPH0186000U/ja active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60256868A (en) * | 1984-06-01 | 1985-12-18 | Fujitsu Ltd | One-chip microcomputer capable of writing to incorporated eprom |
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