Z8F160x Zilog, Z8F160x Datasheet - Page 183
Z8F160x
Manufacturer Part Number
Z8F160x
Description
Z8 Encore / Microcontrollers with Flash Memory and 10 Bit A/D Converter
Manufacturer
Zilog
Datasheet
1.Z8F160X.pdf
(246 pages)
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On-Chip Oscillator
20MHz Crystal Oscillator Operation
PS017610-0404
The Z8F640x family devices feature an on-chip oscillator for use with an external 1-
20MHz crystal. This oscillator generates the primary system clock for the internal eZ8
CPU and the majority of the on-chip peripherals. Alternatively, the X
accept a CMOS-level clock input signal (32kHz-20MHz). If an external clock generator is
used, the X
tain in internal clock divider. The frequency of the signal on the X
the frequency of the system clock. The Z8F640x family device on-chip oscillator does not
support external RC networks or ceramic resonators.
Figure 90 illustrates a recommended configuration for connection with an external
20MHz, fundamental-mode, parallel-resonant crystal. Recommended crystal specifica-
tions are provided in Table 99. Resistor R
Printed circuit board layout should add no more than 4pF of stray capacitance to either the
X
to decrease loading.
IN
or X
OUT
OUT
pins. If oscillation does not occur, reduce the values of capacitors C
pin must be left unconnected. The Z8F640x family device does not con-
Z8F640x/Z8F480x/Z8F320x/Z8F240x/Z8F160x
1
limits total power dissipation by the crystal.
IN
input pin determines
IN
On-Chip Oscillator
input pin can also
Z8 Encore!
1
and C
®
2
165
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