XC68HC05P18A Motorola, XC68HC05P18A Datasheet - Page 21

• Manufacturer Part Number: XC68HC05P18A
• Description: HCMOS Microcontroller Unit
• Manufacturer: Motorola

1.5.2.1 Crystal
MC68HC05P18A
MOTOROLA
NOTE:
The frequency, f
by two to produce the internal PH2 bus clock operating frequency, f
The oscillator cannot be turned off by software if the stop-to-halt
conversion is enabled via mask option.
The circuit in
AT-cut, parallel resonant crystal.
The crystal manufacturer’s recommendations should be followed, as the
crystal parameters determine the external component values required to
provide maximum stability and reliable startup.
The load capacitance values used in the oscillator circuit design should
include all stray capacitances. Mount the crystal and components as
close as possible to the pins for startup stabilization and to minimize
output distortion.
(a)
TO V
OSC1
37 pF
Crystal or Ceramic
Resonator Connections
DD
OR STOP
4.7 M
Figure 1-3
General Description
OSC
Figure 1-3. Oscillator Connections
37 pF
OSC2
, of the oscillator or external clock source is divided
MCU
(a) shows a typical oscillator circuit for an
(b)
TO V
OSC1
DD
External Clock Source
Connections
OR STOP
Functional Pin Description
EXTERNAL CLOCK
UNCONNECTED
General Description
OSC2
Technical Data
MCU
OP
21
.