On these pages, I will introduce a circuit which
arranged the contents introduced by the "Radio Controlled Clock". The changed
part is a display circuit and is made easy to see using the
large-size 7 segment LED. Moreover, an LED matrix is used for the
display of a day of the week, and the display with a Japanese
character(Kanji) is made to perform.
The
almost same software as "Radio Controlled Clock" is used for clock
control software. Reconstruction for outputting time information to
a display is carried out. In "Radio Controlled Clock", PIC16F873 is
used but the input-output port to output time information isn't
enough. Therefore, I decided to use PIC16F877(40 pins).
Latch registers are used to maintain time information for the
display. I used D-FF of the 7-bit x 16 circuits on two CPLDs
(XC9572-84) in order to make a circuit compact. This was created
before for the other circuit.
PIC16F628 is
used for the circuit which displays a day of the week by the kanji
in the LED matrix. Also, an order lighting-up control is done to
suppress the consumption electric power of the LED. PIC16F628 is
used for this control, too. |
Hardware
