The microcontroller IC is a device that looks like a common IC. But inside it, the virtual a miniature computer. This device can be used instead of
transistors and IC older those.
40 years ago Electronics fields used the transistors and ICs were equipment important the various circuit assemblie. but current dividend may become a memory. with the substitution of these microcontroller ICs.
The microcontrollers are also khow as Single computer chip, that smallest. Inside consists of central processing unit, Clock signal unit, input-output unit to connect external devices.
Circuit Microdontroller 68HC705
Today, we can find
microcontrollers have around us. They are used in appliances such as washing machines, microwave ovens, cell phones, printers, video recording, cameras, even in the car was also involved with the micro controller.
This ICs used is the number MC68HC705K1 manufactured by Motorola. Which it is ICs that cheaper, suitable for amateurs to experimentation and use study the performance of the micro-controller.
In the circuit as figure 1 has working as follows, inside IC1 will has The memory containing the program according to the needs of the user. For this training contains of the timer program there are two level are set 60 seconds and 90 seconds. Display a count down to 1 second.