MC68HC08JL3_05 Datasheet, PDF (89/198 Pages) Freescale Semiconductor, Inc – Microcontrollers

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 I/O Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
8.5.1 Crystal Amplifier Input Pin (OSC1). . . . . . . . . . . . . . . . . . . . 92
8.5.2 Crystal Amplifier Output Pin (OSC2/PTA6/RCCLK). . . . . . . 92
8.5.3 Oscillator Enable Signal (SIMOSCEN). . . . . . . . . . . . . . . . . 92
8.5.4 X-tal Oscillator Clock (XTALCLK). . . . . . . . . . . . . . . . . . . . .92
8.5.5 RC Oscillator Clock (RCCLK). . . . . . . . . . . . . . . . . . . . . . . . 93
8.5.6 Oscillator Out 2 (2OSCOUT) . . . . . . . . . . . . . . . . . . . . . . . .93
8.5.7 Oscillator Out (OSCOUT). . . . . . . . . . . . . . . . . . . . . . . . . . . 93
8.6 Low Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
8.6.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93
8.6.2 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.
MC68H(R)C08JL3 — Rev. 4.1
Freescale Semiconductor
Technical Data
89