322 Digital Desk Clock

322 : Digital Desk Clock

  • Author: Samuel Ellicott
  • Description: Simple Digital Clock Project.
  • GitHub repository
  • Clock: 5000000 Hz

How it works

Simple digital clock, displays hours, minutes, and seconds in either a 24h format. Since there are not enough output pins to directly drive a 6x 7-segment displays, the data is shifted out serially using an internal 8-bit shift register. The shift register drives 6-external 74xx596 shift registers to the displays. Clock and control signals (serial_clk, serial_latch) are also used to shift and latch the data into the external shift registers respectively. The time can be set using the hours_set and minutes_set inputs. If set_fast is high, then the the hours or minutes will be incremented at a rate of 5Hz, otherwise it will be set at a rate of 2Hz. Note that when setting either the minutes, rolling-over will not affect the hours setting. If both hours_set and minutes_set are presssed at the same time the seconds will be cleared to zero.

How to test

Connect serial output to a 6x 8-bit shift registers to display the output on 6x 7-segment displays

External hardware

shift registers, 7-segment displays

IO

#InputOutputBidirectional
0refclkserial_data
1use_refclkserial_latch
2fast_setserial_clk
3hours_set
4minutes_set
5
6
7

Chip location

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