MC68HC908JL3E Datasheet, PDF (101/226 Pages) Motorola, Inc – Microcontrollers

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 I/O Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
8.5.1 Crystal Amplifier Input Pin (OSC1). . . . . . . . . . . . . . . . . . . 104
8.5.2 Crystal Amplifier Output Pin (OSC2/PTA6/RCCLK). . . . . . 104
8.5.3 Oscillator Enable Signal (SIMOSCEN). . . . . . . . . . . . . . . . 104
8.5.4 X-tal Oscillator Clock (XTALCLK). . . . . . . . . . . . . . . . . . . . 104
8.5.5 RC Oscillator Clock (RCCLK). . . . . . . . . . . . . . . . . . . . . . . 105
8.5.6 Oscillator Out 2 (2OSCOUT) . . . . . . . . . . . . . . . . . . . . . . . 105
8.5.7 Oscillator Out (OSCOUT). . . . . . . . . . . . . . . . . . . . . . . . . . 105
8.6 Low Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .105
8.6.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
8.6.2 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.
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Oscillator (OSC)
Technical Data
101