Calling Line Identifier
FX602
1.5.9 Xtal Osc and Clock Dividers
Frequency and timing accuracy of the FX602 is determined by a 3.579545MHz clock present at the XTAL pin.
This may be generated by the on-chip oscillator inverter using the external components C1, C2 and X1 of
Figure 2, or may be supplied from an external source to the XTAL input, in which case C1, C2 and X1 should
not be fitted.
The oscillator is turned off in the 'Zero-Power' modes.
If the clock is provided by an external source which is not always running, then the ZP input must be set high
when the clock is not available. Failure to observe this rule may cause a significant rise in the supply current
drawn by FX602 as well as generating undefined states of the RXD, DET and IRQN outputs.
ã 1998 Consumer Microcircuits Limited
13
D/602/7
CMLMICRO [ CML MICROCIRCUITS ]
