MC68H(R)C08JL3
—
Rev. 4.1
Technical Data
Freescale Semiconductor
89
Technical Data — MC68H(R)C08JL3
Section 8. Oscillator (OSC)
8.1 Contents
8.2
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89
8.3
X-tal Oscillator (MC68HC08xxx). . . . . . . . . . . . . . . . . . . . . . . .90
8.4
RC Oscillator (MC68HRC08xxx) . . . . . . . . . . . . . . . . . . . . . . .91
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .92
Crystal Amplifier Input Pin (OSC1). . . . . . . . . . . . . . . . . . . .92
Crystal Amplifier Output Pin (OSC2/PTA6/RCCLK). . . . . . .92
Oscillator Enable Signal (SIMOSCEN). . . . . . . . . . . . . . . . .92
X-tal Oscillator Clock (XTALCLK). . . . . . . . . . . . . . . . . . . . .92
RC Oscillator Clock (RCCLK). . . . . . . . . . . . . . . . . . . . . . . .93
Oscillator Out 2 (2OSCOUT) . . . . . . . . . . . . . . . . . . . . . . . .93
Oscillator Out (OSCOUT). . . . . . . . . . . . . . . . . . . . . . . . . . .93
8.6
8.6.1
8.6.2
Low Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93
Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93
Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93
8.7
Oscillator During Break Mode. . . . . . . . . . . . . . . . . . . . . . . . . .94
8.2 Introduction
The oscillator module provides the reference clock for the MCU system
and bus. Two types of oscillator modules are available:
MC68HC08xxx— built-in oscillator module (X-tal oscillator) that
requires an external crystal or ceramic-resonator. This option also
allows an external clock that can be driven directly into OSC1.
MC68HRC08xxx — built-in oscillator module (RC oscillator) that
requires an external RC connection only.