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Real Time Clock ATMega16


The ATMega16 chip in the M16 has a real-time counter that operates asynchronously when a 32,768hz watch crystal is connected to it, providing a real-time clock. Bascom has built-in support for the RTC, making it very easy to use time functions. The watch crystal needs to connect to pins TOSC1(pin 28) and TOSC2(pin 29). The time and date can be set via the PC serial port connection.

Real Time Clock M16

Hardware requirements

  • ATMega16
  • 32,768 KHz crystal
  • LCD display
  • RS232 port


BASCOM-AVR Real Time Clock example, the time can be set in a terminal program like hyperterminal.

'Real-Time Clock Example
'target device: ATMega16
'compilar: BASCOM-AVR
'date: 18-07-2008

    Enable Interrupts
    Config Clock = Soft       'This command inits the clock

    Config Lcdpin = Pin , Db4 = Portb.0 , Db5 = Portb.1 , Db6 = Portb.2 ,
	Db7 = Portb.3 , E = Portb.6 , Rs = Portb.7

    $crystal = 10000000       'give here the value of the X-tal you use in Hertz

    $baud = 9600

    Config Date = Ymd , Separator = -                       ' ANSI-Format

    Input "Enter the time (hh:mm:ss):" , Time$
    Input "Enter the date (mm/dd/yy):" , Date$

    Cursor Off

    Locate 1 , 1
    Lcd "Real Time Clock"

       Locate 2 , 1
       Lcd Time$
       Locate 3 , 1
       Lcd Date$
       Wait 1


For more details, click: Real Time Clock ATMega16


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