五里ム中

そーりー。じゃぱにーずおんりー。

April 10, 2005

クロックとリセットが完成

[TD4]

TD4 - リセット回路とクロック回路が完成した状態

クロックとリセットが完成しました。動作も確認。1Hzで動かすと、テスターの針が大きくふれて、10Hzで動かすと2.5V付近でピクピク動きます。たぶん正常に動いてる……。

写真はクロックとリセットが完成した状態。まだ右下が埋まっただけです。先は長い！
左側にI/Oをおさめる余裕がちゃんと残ってるか心配です……。まぁ、なにごともいきあたりばったりですよね（違）。

ちなみに写真を撮った後に、パスコン（ICの反応速度に電力供給を間に合わせるためのコンデンサ）をつけていないことに気がつきました。早速、取り付けようとしたのですが、セラミックコンデンサが大きすぎて上手く穴に入りません。２本の導線を隣どうしの穴に入れたいのに入らない。。どうやら、大きすぎるコンデンサを買ってきてしまったみたいです。しかも、本には「積層」って書いてあるけど、買ったのは積層ではなかったらしい（別に積層である必要は全くないんですが）。平べったい団扇型（？）のじゃなくて、もっと小さい米粒みたいなのを買うべきだったみたいです。
まぁ、大きなものでもつけようと思えばつくのですが、たぶん、後で他の部品と干渉してきそうなので、小さなのを用意しようと思います。

で、この失敗に気を取られていたら、大きなパスコン（本によると「国内の石油備蓄基地」）に使うコンデンサを間違えてました。100uFを取り付けるはずが、何故か47uF……。まぁ、所詮はパスコンですし、多少小さくてもかまわないと思うのですが、なんか気持ち悪いので、わざわざはずして交換。これは、経験不足とかではなくケアレスミスでした……。反省。

次はCPU本体です。

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