MC68HC908LJ12 Datasheet, PDF (97/413 Pages) Freescale Semiconductor, Inc – 8-bit microcontroller units

Oscillator (OSC)
7.5.1 Crystal Amplifier Input Pin (OSC1)
OSC1 pin is an input to the crystal oscillator amplifier. Schmitt trigger and
glitch filter are implemented on this pin to improve EMC performance.
See Section 23. Electrical Specifications for detail specification of the
glitch filter.
7.5.2 Crystal Amplifier Output Pin (OSC2)
OSC2 pin is the output of the crystal oscillator inverting amplifier.
7.5.3 Oscillator Enable Signal (SIMOSCEN)
The SIMOSCEN signal from the system integration module (SIM)
enables/disables the internal RC and x-tal oscillator circuits.
7.5.4 Internal RC Clock (ICLK)
The ICLK clock is the output from the internal RC oscillator. This clock
drives the SIM and COP modules.
7.5.5 CGM Oscillator Clock (CGMXCLK)
The CGMXCLK clock is the output from the x-tal oscillator. This clock
drives to CGM, real time clock module, analog-to-digital converter, liquid
crystal display driver module, and other MCU sub-systems.
7.5.6 CGM Reference Clock (CGMRCLK)
This is buffered signal of CGMXCLK, it is used by the CGM as the
phase-locked-loop (PLL) reference clock.
7.6 Low Power Modes
The WAIT and STOP instructions put the MCU in low-power
consumption standby modes.
Technical Data
98
Oscillator (OSC)
MC68HC908LJ12 — Rev. 2.1
Freescale Semiconductor