MC68HC908JK3 MOTOROLA [Motorola, Inc], MC68HC908JK3 Datasheet - Page 98

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MC68HC908JK3

Manufacturer Part Number
MC68HC908JK3
Description
MC68HC908JK1
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet

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Oscillator (OSC)
8.5 I/O Signals
8.5.1 Crystal Amplifier Input Pin (OSC1)
8.5.2 Crystal Amplifier Output Pin (OSC2/PTA6/RCCLK)
8.5.3 Oscillator Enable Signal (SIMOSCEN)
8.5.4 X-tal Oscillator Clock (XTALCLK)
Technical Data
98
The following paragraphs describe the oscillator I/O signals.
OSC1 pin is an input to the crystal oscillator amplifier or the input to the
RC oscillator circuit.
For the X-tal oscillator device, OSC2 pin is the output of the crystal
oscillator inverting amplifier.
For the RC oscillator device, OSC2 pin can be configured as a general
purpose I/O pin PTA6, or the output of the internal RC oscillator clock,
RCCLK.
The SIMOSCEN signal comes from the system integration module (SIM)
and enables/disables the X-tal oscillator circuit or the RC-oscillator.
XTALCLK is the X-tal oscillator output signal. It runs at the full speed of
the crystal (f
Figure 8-1
OSC2 and may not represent the actual circuitry. The duty cycle of
XTALCLK is unknown and may depend on the crystal and other external
factors. Also, the frequency and amplitude of XTALCLK can be unstable
at start-up.
X-tal oscillator
RC oscillator
shows only the logical relation of XTALCLK to OSC1 and
Option
XCLK
Oscillator (OSC)
) and comes directly from the crystal oscillator circuit.
Controlled by PTAEN bit in PTAPUER ($0D)
PTA6EN = 0: RCCLK output
PTA6EN = 1: PTA6 I/O
OSC2 pin function
Inverting OSC1
MC68H(R)C908JL3
MOTOROLA
Rev. 1.0

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