Hardware for this example: - Atmel AVR ATmega16 @ 1MHz internal R/C (factory default) - 32kHz Watch-Crystal connected to the ATmega's TOSC1/TOSC2 pins - Text-Mode LCD-display. In the example a Displaytech 164A (16*4) display has been used (KS0070B). For connection with an Atmel STK500 see connect.txt. - Two buttons (active-low) at PORTB pin 0 and 1 to set the clock To adopt this code to own developments: - Change XTAL in lcd.h, the delay-loop in rtcasync.c and the timer1 setup in main.c for main frequency other than 1MHz. - Change the key-#defines in main.c for other button- assignments. - Change lcd.h to reflect LCD-connection to AVR. - The LCD line-to-DRAM-Addresses in lcd.h are set for a Displaytech 164A display with a KS0070B controller. These values may have to be changed for other controllers to reflect the values given in the controller's datasheet. (LCD_START_LINEx in lcd.h) - Undefine "SPASS" in main.c to disable the startup-message. - See the errata in the ATmega8 datasheet if you'd like to use an ATmega8.




File list:
lcdclock
.......\bin
.......\...\main.hex
.......\connect.txt
.......\lcd.c
.......\lcd.h
.......\lcdbignum.c
.......\lcdbignum.h
.......\lcdclock.pnproj
.......\main.c
.......\makefile
.......\readme.txt
.......\rtcasync.c
.......\rtcasync.h