Maybe for some readers Digital Clock is a very simple or too general, but of the Digital Clock to learn the basic principles of control with a microcontroller, such as 7 segment display system and the use of timers.
Click on image for actual size
A complete range of Digital Clock is shown in Figure 1, equipped with 4 pieces of 7 segment LED display to display the time, consists of dozens of hours numbers, hours, tens of minutes and unit minutes. SW1 and SW2 button is used to set the display time, when SW1 is pressed on the display clock rate will increase every second, while SW2 is used to adjust the display digit minutes in the same way.
12 MHz crystal and capacitors C1 and C2 form a series of working frequency oscillator generating AT89C2051, this series is a series of raw, meaning that form the oscillator circuit is always like this for all series AT89C51, except for purposes other crystal values are probably different.
The combination of capacitors C3 and R8 detainees is also a standard circuit, this component is used to form a series of 'power on reset', meaning the circuit will automatically reset every time AT89C2051 AT89C2051 begin receiving power source.
Looking at the circuit in Figure 1, it can not explain how this digital clock works, because the series was just part-timer button and the display of time, 'Clock' is actually a program stored in the ROM that is in the IC AT89C2051.
Digital Clock is a complete program, along with the scheme drawings and images in a format PCB Orcad 9, can be downloaded here
Click on image for actual size
A complete range of Digital Clock is shown in Figure 1, equipped with 4 pieces of 7 segment LED display to display the time, consists of dozens of hours numbers, hours, tens of minutes and unit minutes. SW1 and SW2 button is used to set the display time, when SW1 is pressed on the display clock rate will increase every second, while SW2 is used to adjust the display digit minutes in the same way.
12 MHz crystal and capacitors C1 and C2 form a series of working frequency oscillator generating AT89C2051, this series is a series of raw, meaning that form the oscillator circuit is always like this for all series AT89C51, except for purposes other crystal values are probably different.
The combination of capacitors C3 and R8 detainees is also a standard circuit, this component is used to form a series of 'power on reset', meaning the circuit will automatically reset every time AT89C2051 AT89C2051 begin receiving power source.
Looking at the circuit in Figure 1, it can not explain how this digital clock works, because the series was just part-timer button and the display of time, 'Clock' is actually a program stored in the ROM that is in the IC AT89C2051.
Digital Clock is a complete program, along with the scheme drawings and images in a format PCB Orcad 9, can be downloaded here
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its cool