clock pulses of 3.579 MHz frequency. Because these are very common and
inexpensive they are used in many other applications, for example DTMF
generators. It is a common clock for HT9170B DTMF decoder. It uses the
mechanical resonance of a vibrating crystal of piezoelectric material t..
‘Watch’ or Real-Time-Clock crystal. 32.768 kHz means it is precisely half of a
16-bit counter. Start counting at 0x8000 (or 32768). When the counter rolls
over from 65535 to 0, then you know that exactly one second has passed. Reset
the interrupt, reset the counter, and start counting a..