MC68HC908JK1 Datasheet, PDF (95/210 Pages) Motorola, Inc – MC68HC908JK1

Technical Data — MC68H(R)C908JL3
Section 8. Oscillator (OSC)
8.1 Contents
8.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
8.3 X-tal Oscillator (MC68HC908xxx). . . . . . . . . . . . . . . . . . . . . . . 96
8.4 RC Oscillator (MC68HRC908xxx) . . . . . . . . . . . . . . . . . . . . . . 97
8.5 I/O Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
8.5.1 Crystal Amplifier Input Pin (OSC1). . . . . . . . . . . . . . . . . . . . 98
8.5.2 Crystal Amplifier Output Pin (OSC2/PTA6/RCCLK). . . . . . . 98
8.5.3 Oscillator Enable Signal (SIMOSCEN). . . . . . . . . . . . . . . . . 98
8.5.4 X-tal Oscillator Clock (XTALCLK). . . . . . . . . . . . . . . . . . . . . 98
8.5.5 RC Oscillator Clock (RCCLK). . . . . . . . . . . . . . . . . . . . . . . . 99
8.5.6 Oscillator Out 2 (2OSCOUT) . . . . . . . . . . . . . . . . . . . . . . . . 99
8.5.7 Oscillator Out (OSCOUT). . . . . . . . . . . . . . . . . . . . . . . . . . . 99
8.6 Low Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
8.6.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
8.6.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
8.7 Oscillator During Break Mode. . . . . . . . . . . . . . . . . . . . . . . . . 100
8.2 Introduction
The oscillator module provides the reference clock for the MCU system
and bus. Two types of oscillator modules are available:
• MC68HC908xxx— 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.
• MC68HRC908xxx — built-in oscillator module (RC oscillator) that
requires an external RC connection only.
MC68H(R)C908JL3 — Rev. 1.0
MOTOROLA
Oscillator (OSC)
Technical Data
95