MC9S08DZ128 Datasheet, PDF (167/458 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 8 Multi-Purpose Clock Generator (S08MCGV2)
8.1.1 Features
Key features of the MCG module are:
• Frequency-locked loop (FLL)
— Internal or external reference can be used to control the FLL
• Phase-locked loop (PLL)
— Voltage-controlled oscillator (VCO)
— Modulo VCO frequency divider
— Phase/Frequency detector
— Integrated loop filter
— Lock detector with interrupt capability
• Internal reference clock
— Nine trim bits for accuracy
— Can be selected as the clock source for the MCU
• External reference clock
— Control for external oscillator
— Clock monitor with reset capability
— Can be selected as the clock source for the MCU
• Reference divider is provided
• Clock source selected can be divided down by 1, 2, 4, or 8
• BDC clock (MCGLCLK) is provided as a constant divide by 2 of the DCO output whether in an
FLL or PLL mode.
• Two selectable digitally controlled oscillators (DCOs) optimized for different frequency ranges.
• Option to maximize DCO output frequency for a 32,768 Hz external reference clock source.
MC9S08DZ128 Series Data Sheet, Rev. 1
Freescale Semiconductor
167