mcf51jf128 Freescale Semiconductor, Inc, mcf51jf128 Datasheet - Page 432

• Manufacturer Part Number: mcf51jf128
• Description: Mcf51jf128 Reference Manual
• Manufacturer: Freescale Semiconductor, Inc

Introduction
432
• Internal reference clock generator
• Control signals for "the MCG external reference low power oscillator clock
• External clock from the Crystal Oscillator
• External clock from the Real Time Counter (RTC)
• External clock monitor with reset and interrupt request capability to check for
• Lock detector with interrupt request capability for use with the PLL
generators are provided:
external clock failure when running in FBE, PEE, BLPE, or FEE modes
• Voltage-controlled oscillator (VCO)
• External reference clock is used as the PLL source
• Modulo VCO frequency divider
• Phase/Frequency detector
• Integrated loop filter
• Can be used as a clock source for other on-chip peripherals.
• Slow clock with nine trim bits for accuracy
• Fast clock with four trim bits
• Can be used as source clock for the FLL. In FEI mode, only the slow Internal
• Either the slow or the fast clock can be selected as the clock source for the MCU
• Can be used as a clock source for other on-chip peripherals
• HGO, RANGE, EREFS
• Can be used as a source for the FLL and/or the PLL.
• Can be selected as the clock source for the MCU
• Can only be used as a source for the FLL.
• Can be selected as the clock source for the MCU
Reference Clock (IRC) can be used as the FLL source.
MCF51JF128 Reference Manual, Rev. 2, 03/2011
Preliminary
Freescale Semiconductor, Inc.