If you are just trying to implement a clock (no calendar) and that is all
your system is going to do... skip the RTC (Real Time Clock) IC and refer to
Microchip Application Note AN590 (see www.microchip.com) which implements a
clock in a 16c54. Although I haven't looked at the code, I can see no good
reason why it shouldn't work in an '84 with minor modification. The only
exception is that you have less I/O so you will have to get fancy with the
switch inputs, multiplexing I/O in some way. Refer to AN529 'Multiplexing
LED Drive and a 4*4 Keypad Sampling' for some hints.


-----Original Message-----
From: Bonassina Ivano <bonassin@TIN.IT>
To: PICLIST@MITVMA.MIT.EDU <PICLIST@MITVMA.MIT.EDU>
Date: Tuesday, December 16, 1997 11:01 AM
Subject: CLOCK-CALENDAR ... PCF8583 ... PIC CODE ?


>Someone can help me to find an ASM code for PIC ( 16C84 in better ) to
>realize, like an hobbiest, a simple and normal CLOCK ?
>Thanks in advance.
>Bye Ciao