MC68HC05V12 Datasheet, PDF (30/246 Pages) Freescale Semiconductor, Inc – HCMOS Microcontreller Unit

Freescale Semiconductor, Inc.
General Description
The load capacitance values used in the oscillator circuit design should
include all stray capacitances. The crystal and components should be
mounted as close as possible to the pins for startup stabilization and to
minimize output distortion and radiated emissions.
1.6.5.2 Ceramic Resonator Oscillator
In cost-sensitive applications, a ceramic resonator can be used in place
of the crystal. The circuit in Figure 1-3(a) can be used for a ceramic
resonator.
NOTE:
The resonator manufacturer’s recommendations should be followed, as
the resonator parameters determine the external component values
required for maximum stability and reliable starting.
The load capacitance values used in the oscillator circuit design should
include all stray capacitances. The ceramic resonator and components
should be mounted as close as possible to the pins for startup
stabilization and to minimize output distortion and radiated emissions.
1.6.5.3 External Clock
An external clock from another CMOS-compatible device can be
connected to the OSC1 input. The OSC2 pin should be left unconnected,
as shown in Figure 1-3(b).
1.6.6 RESET
This pin can be used as an input to reset the MCU to a known startup
state by pulling it to the low state. The RESET pin contains an internal
Schmitt trigger to improve its noise immunity as an input. The RESET pin
has an internal pulldown device that pulls the RESET pin low when there
is an internal computer operating properly (COP) watchdog reset,
power-on reset (POR), illegal address reset, a disabled STOP
instruction reset, or an internal low-voltage reset. Refer to
Section 5. Resets.
Technical Data
General Description
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MC68HC05V12 — Rev. 2.0