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MC68H(R)C908JL3E/JK3E/JK1E
—
Rev. 2.0
Technical Data
MOTOROLA
Oscillator (OSC)
101
Technical Data – MC68H(R)C908JL3E/JK3E/JK1E
Section 8. Oscillator (OSC)
8.1 Contents
8.2
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .101
8.3
X-tal Oscillator (MC68HC908JL3E/JK3E/JK1E). . . . . . . . . . .102
8.4
RC Oscillator (MC68HRC908JL3E/JK3E/JK1E) . . . . . . . . . .103
8.5
8.5.1
8.5.2
8.5.3
8.5.4
8.5.5
8.5.6
8.5.7
I/O Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .104
Crystal Amplifier Input Pin (OSC1). . . . . . . . . . . . . . . . . . .104
Crystal Amplifier Output Pin (OSC2/PTA6/RCCLK). . . . . .104
Oscillator Enable Signal (SIMOSCEN). . . . . . . . . . . . . . . .104
X-tal Oscillator Clock (XTALCLK). . . . . . . . . . . . . . . . . . . .104
RC Oscillator Clock (RCCLK). . . . . . . . . . . . . . . . . . . . . . .105
Oscillator Out 2 (2OSCOUT) . . . . . . . . . . . . . . . . . . . . . . .105
Oscillator Out (OSCOUT). . . . . . . . . . . . . . . . . . . . . . . . . .105
8.6
8.6.1
8.6.2
Low Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .105
Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .105
Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .105
8.7
Oscillator During Break Mode. . . . . . . . . . . . . . . . . . . . . . . . .106
8.2 Introduction
The oscillator module provides the reference clock for the MCU system
and bus. Two types of oscillator modules are available:
MC68HC908JL3E/JK3E/JK1E — built-in oscillator module (X-tal)
that requires an external crystal or ceramic-resonator. This option
also allows an external clock that can be driven directly into OSC1.
MC68HRC908JL3E/JK3E/JK1E — built-in oscillator module (RC)
that requires an external RC connection only.