MC68HC908JK3EMP MOTOROLA [Motorola, Inc], MC68HC908JK3EMP Datasheet - Page 104

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MC68HC908JK3EMP

Manufacturer Part Number
MC68HC908JK3EMP
Description
Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
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
104
MC68HRC908JL3E/JK3E/JK1E
MC68HC908JL3E/JK3E/JK1E
Device
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.
shows only the logical relation of XTALCLK to OSC1 and
XCLK
Oscillator (OSC)
) and comes directly from the crystal oscillator circuit.
Oscillator
X-tal
RC
Controlled by PTA6EN bit in PTAPUER ($0D)
MC68H(R)C908JL3E/JK3E/JK1E
PTA6EN = 0: RCCLK output
PTA6EN = 1: PTA6 I/O
OSC2 pin function
Inverting OSC1
MOTOROLA
Rev. 2.0

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